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Journal articles on the topic 'Stereoselective reaction'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Misra, Anup Kumar, Arin Gucchait, and Monalisa Kundu. "Synthesis of Pentasaccharide Repeating Unit Corresponding to the Cell Wall O-Polysaccharide of Salmonella enterica O55 Strain Containing a Rare Sugar 3-Acetamido-3-deoxy-d-fucose." Synthesis 53, no. 19 (2021): 3613–20. http://dx.doi.org/10.1055/s-0037-1610777.

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AbstractA pentasaccharide repeating unit corresponding to the cell wall O-antigen of Salmonella enterica O55 containing a rare sugar, 3-acetamido-3-deoxy-d-fucose has been synthesized as its p-methoxyphenyl glycoside using a sequential stereoselective glycosylation strategy. A suitably functionalized 3-azido-3-deoxy-d-fucose thioglycoside derivative was prepared in very good yield and used in the stereoselective glycosylation reaction. Functionalized monosaccharide intermediates were prepared judiciously and stereoselectively assembled to get the desired pentasaccharide derivative in excellent

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2

M, Heravi; Majid, and A.T. Kal-Koshvandi. "Applications of Dainshefsky's Dienes in the Asymmetric synthesis of Aza-Diels-Alder Reaction." Chemical Record 19, no. 2 (2018): 550–600. https://doi.org/10.1002/tcr.201800066.

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Asymmetric hetero-Diels-Alder (AHDA) reactions provide a multitude of opportunities for the highly efficient, regio- and stereoselective construction of various heterocycles in enantiomerically pure form. The asymmetric aza-Diels-Alder (A-aza-DA) reaction using diversely hetero-dienophiles and hetero-dienes have been increasingly developed as a valuable method for the synthesis of functionalized nitrogen ring systems. The purpose of this review is to give a detailed discussion of the A-aza-DA reaction particularly, the stereoselective reactions of imines as dienophiles with Dainshefsky dienes

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3

Rossi, Sergio, Tiziana Benincori, Laura Maria Raimondi, and Maurizio Benaglia. "3,3′-Bithiophene-Based Chiral Bisphosphine Oxides as Organocatalysts in Silicon-Derived Lewis Acid Mediated Reactions." Synlett 31, no. 06 (2020): 535–46. http://dx.doi.org/10.1055/s-0039-1690777.

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This account summarizes the development of new biheteroaromatic chiral bisphosphine oxides. 3,3′-Bithiophene-based phosphine oxides (BITIOPOs) have been successfully used as organocatalysts to promote Lewis base catalyzed, Lewis acid mediated stereoselective transformations. These highly electron-rich compounds, in combination with trichorosilyl derivatives (allyltrichlorosilane and silicon tetrachloride), generate hypervalent silicon species that act as chiral Lewis acids in highly diastereo- and enantioselective organic reactions. Several relevant examples related to these applications are d

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4

Klegraf, Ellen, and Horst Kunz. "Stereoselective Synthesis of 3-Substituted and 3,4-Disubstituted Piperidine und Piperidin-2-one Derivatives." Zeitschrift für Naturforschung B 67, no. 4 (2012): 389–405. http://dx.doi.org/10.1515/znb-2012-0413.

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The stereoselective synthesis of 3-substituted and 3,4-disubstituted piperidine and piperidin-2-one derivatives was achieved starting from 2-pyridone. After N-galactosylation and subsequent O-silylation, nucleophilic addition of organometallic reagents proceeded with high regio- and stereoselectivity at 4-position. Substituents at position 3 were stereoselectively introduced by reaction of electrophiles with amide enolates of the N-galactosyl-2-piperidones.

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5

Penumati, Nageshwar Rao, та Nagaiah Kommu. "Stereoselective Synthesis of (+)-α-Conhydrine from R-(+)-Glyceraldehyde". Organic Chemistry International 2014 (20 жовтня 2014): 1–7. http://dx.doi.org/10.1155/2014/982716.

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Stereoselective synthesis of (+)-α-Conhydrine was accomplished from protected (R)-(+)-glyceraldehyde, a familiar carbohydrate predecessor. Our synthetic strategy featured the following two key reactions. One is Zn-mediated stereoselective aza-Barbier reaction of imine 6 with allyl bromide to afford chiral homoallylic amine 7, and the other is ring-closing metathesis.

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6

Woo, Simon, Masood Parvez, and Brian A. Keay. "Regio- and stereoselective ring openings of unsymmetrical oxatricyclo adducts." Canadian Journal of Chemistry 75, no. 6 (1997): 665–80. http://dx.doi.org/10.1139/v97-081.

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SN2′ ring-opening reactions of a number of substituted 11-oxatricyclo[6.2.1.01,6]undec-9-en-5-ones prepared via the intramolecular Diels–Alder reaction employing a furan diene (IMDAF) are reported. Primary, secondary, and tertiary organolithium reagents were capable of effecting the ring-opening reaction, while methyllithium required activation before any ring opening was observed. Hydride reagents, organocuprates, and Grignard reagents were generally ineffective. The ring-opening reaction was highly regio- and stereoselective for attack at C9syn to the bridging oxygen atom provided that C8 wa

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7

Schultz, Jeremy F., Bing Yang, and Nan Jiang. "Direct observation of the geometric isomer selectivity of a reaction controlled via adsorbed bromine." Nanoscale 12, no. 4 (2020): 2726–31. http://dx.doi.org/10.1039/c9nr09857g.

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8

Liu, Yuxiao, Yongming Deng, Peter Y. Zavalij, Renhua Liu та Michael P. Doyle. "An efficient route to highly enantioenriched tetrahydroazulenes and β-tetralones by desymmetrization reactions of δ,δ-diaryldiazoaceto-acetates". Chemical Communications 51, № 3 (2015): 565–68. http://dx.doi.org/10.1039/c4cc08255a.

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9

Ross, Günther, та Ivar Ugi. "Stereoselective syntheses of α-amino acid and peptide derivatives by the U-4CR of 5-desoxy-5-thio-D-xylopyranosylamine". Canadian Journal of Chemistry 79, № 12 (2001): 1934–39. http://dx.doi.org/10.1139/v01-186.

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Since 1961, the synthesis of α-amino acids derivatives by the four-component reaction of isocyanides (U-4CR) as a one-pot reaction has been developed. Only recently it was found that a variety of these α-amino acids compounds can be formed stereoselectively by the U-4CR using 1-amino-5-deoxy-5-thio-2,3,4-tri-O-isobutanoyl-β-D-xylopyranose as the amine component. The stereoselectivity inducing auxiliary 5-desoxy-5-thio-D-xylopyranosyl group of the so-formed products can be replaced selectively by hydrogen.Key words: stereoselective U-4CR, chiral amine component, amino carbohydrate, α-amino acid

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10

Cantin, Michel, Yao-Chang Xu, and Pierre Deslongchamps. "Stereocontrolled construction of A.B.C.[6.6.6] tricycle via transannular Diels–Alder reaction of 14-membered triene macrocycle." Canadian Journal of Chemistry 68, no. 12 (1990): 2144–52. http://dx.doi.org/10.1139/v90-329.

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The synthesis of the four acyclic trienes 11a, b and 20a, b is reported. The tandem macrocyclization and stereoselective transannular Diels–Alder reaction of acyclic trienes 11b (trans-trans-cis) and 20b (trans-trans-trans) were observed in the presence of Cs2CO3 at 85 °C to give tricycles 30 (TST) and 32 (CAT) respectively. However, treatment of acyclic trienes 11a (cis-trans-cis) and 20a (cis-trans-trans) under the same conditions yielded the 14-membered macrocycles 21 and 23, which were stereoselectively transformed at 250 °C into tricycles 22 (CST) and 24 (CAT) respectively in excellent yi

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11

Yang, Yang. "Building polyfunctional piperidines: a stereoselective strategy of a three-component Mannich reaction inspired by biosynthesis and applications in the synthesis of natural alkaloids (+)-241D; (−)-241D; isosolenopsin A and (−)-epimyrtine." RSC Advances 5, no. 24 (2015): 18894–908. http://dx.doi.org/10.1039/c4ra14418j.

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12

Yajima, Tomoko, Eriko Yoshida та Masako Hamano. "Diastereoselective radical addition to γ-alkyl-α-methylene-γ-butyrolactams and the synthesis of a chiral pyroglutamic acid derivative". Beilstein Journal of Organic Chemistry 9 (17 липня 2013): 1432–36. http://dx.doi.org/10.3762/bjoc.9.161.

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The cis- and trans-stereoselective radical additions to α-methylene-γ-alkyl- γ-lactams were investigated and the scope and limitation of the reaction were also revealed. This stereoselective radical reaction was used for synthesis of chiral pyroglutamic acid derivatives starting from a commercially available chiral amino acid.

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13

Sugita, Kazuyuki, Motoi Kuwabara, Ami Matsuo, Shogo Kamo, and Akinobu Matsuzawa. "Stereoselective Convergent Synthesis of Carbon Skeleton of Cotylenin A Aglycone." Synthesis 53, no. 12 (2021): 2092–102. http://dx.doi.org/10.1055/s-0040-1706684.

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AbstractIn this paper, the synthesis of the carbon skeleton of cotylenin A aglycone is described. The key reactions, including an intramolecular aldol reaction, an aldol coupling reaction, and a ring-closing metathesis, allow for the effective and stereoselective access to the carbon skeleton of cotylenin A aglycone. The stereochemistry was confirmed by single-crystal X-ray crystallographic analyses of related compounds.

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14

Fischer, Róbert, Ondrej Záborský, Radka Štadániová, Jana Doháňošová, and Ján Moncol. "Synthesis of Isoxazolidinyl Epoxides by Oxone Treatment of 2,3-Dihydroisoxazoles in Acetone–Water Solution: A New Stereoselective Approach to Hydroxy-Substituted Isoxazolidines." Synthesis 49, no. 22 (2017): 4942–54. http://dx.doi.org/10.1055/s-0036-1590924.

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A practical and efficient synthesis of new class of isoxazolidinyl epoxides by direct treatment of 4,5-unsubstituted 2,3-dihydroisoxazoles with Oxone and NaHCO3 in acetone/water solution is described. All epoxidation reactions proceed with excellent anti-selectivity and provide stable products in very good yields. A concept for the development of stereoselective approach to 3,4-trans-hydroxy-substituted isoxazolidines, namely triazole derivatives as important molecules in medicinal chemistry is presented. The synthesis is characterized by highly syn-stereoselective conversion of epoxides to a

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15

Gangadhar, Pamarthi, Sayini Ramakrishna, Ponneri Venkateswarlu, and Pabbaraja Srihari. "Stereoselective total synthesis and structural revision of the diacetylenic diol natural products strongylodiols H and I." Beilstein Journal of Organic Chemistry 14 (September 4, 2018): 2313–20. http://dx.doi.org/10.3762/bjoc.14.206.

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The stereoselective total synthesis of strongylodiol H and I has been accomplished. The synthetic procedure comprised the stereoselective reduction of a ketone functionality in an ene–yne–one employing CBS as a catalyst and a Cadiot–Chodkiewicz coupling reaction as the key reaction steps. A common aldehyde intermediate has been used for the synthesis of both strongylodiols.

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16

Janzen, Alexander F., and Meehae Jang. "Isomerization, fluorine exchange, and stereoselective synthesis of cis- and trans-F2TePh3Cl: application of the coordination model of reaction mechanisms." Canadian Journal of Chemistry 67, no. 1 (1989): 71–75. http://dx.doi.org/10.1139/v89-012.

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The stereoselective synthesis of cis- and trans-F2TePh3Cl (phenyl substituents adopt a mer arrangement) via 5-coordinate cations Ph3TeFCl+ and [Formula: see text] is described. trans-F2TcPh3Cl isomerizes to the thermodynamically more stable cis isomer, and cis -F2TePh3Cl has non-equivalent fluorines which undergo stereoselective fluorine exchange, as confirmed by 19F and l25Te nmr spectroscopy. These results are consistent with an intermolecular mechanism of isomerization and fluorine exchange involving Te—F bond cleavage.The coordination model of reaction mechanisms provides a unified descrip

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17

Escalante, Carlos H., Eder I. Martínez-Mora, Carlos Espinoza-Hicks, et al. "Highly selective Diels–Alder and Heck arylation reactions in a divergent synthesis of isoindolo- and pyrrolo-fused polycyclic indoles from 2-formylpyrrole." Beilstein Journal of Organic Chemistry 16 (June 17, 2020): 1320–34. http://dx.doi.org/10.3762/bjoc.16.113.

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A highly regio-, chemo- and stereoselective divergent synthesis of isoindolo- and pyrrolo-fused polycyclic indoles is herein described, starting from 2-formylpyrrole and employing Diels–Alder and Heck arylation reactions. 3-(N-Benzyl-2-pyrrolyl)acrylates and 4-(pyrrol-2-yl)butenones underwent a highly endo-Diels–Alder cycloaddition with maleimides to furnish octahydropyrrolo[3,4-e]indoles, which served as precursors in the regioselective synthesis of aza-polycyclic skeletons via an intramolecular Heck arylation reaction. Through the latter reaction, the 3-(N-benzyl-2-pyrrolyl)acrylates give ri

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18

Pereira, Ana Margarida, Honorina Cidade, and Maria Elizabeth Tiritan. "Stereoselective Synthesis of Flavonoids: A Brief Overview." Molecules 28, no. 1 (2023): 426. http://dx.doi.org/10.3390/molecules28010426.

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Stereoselective synthesis has been emerging as a resourceful tool because it enables the obtaining of compounds with biological interest and high enantiomeric purity. Flavonoids are natural products with several biological activities. Owing to their biological potential and aiming to achieve enantiomerically pure forms, several methodologies of stereoselective synthesis have been implemented. Those approaches encompass stereoselective chalcone epoxidation, Sharpless asymmetric dihydroxylation, Mitsunobu reaction, and the cycloaddition of 1,4-benzoquinone. Chiral auxiliaries, organo-, organomet

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19

Shindo, M., and K. Yaji. "Scandium-Catalyzed Stereoselective Nazarov Reaction." Synfacts 2009, no. 12 (2009): 1358. http://dx.doi.org/10.1055/s-0029-1218236.

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20

Riant, O., O. Chuzel, J. Deschamps, and C. Chausteur. "Stereoselective Tandem Reductive Aldol Reaction." Synfacts 2007, no. 3 (2007): 0313. http://dx.doi.org/10.1055/s-2007-968183.

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21

Smetanin, N. V., S. A. Varenichenko, A. V. Mazepa, O. K. Farat, A. V. Kharchenko, and V. I. Markov. "Atom-economic Michael reaction between hydroacridines and arylmaleimides without catalyst/additive." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 5 (October 2022): 102–9. http://dx.doi.org/10.32434/0321-4095-2022-144-5-102-109.

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Previously unknown spiroderivatives of 3,1-benzoxazines were synthesized by the reaction of anthranilic acid with cyclic ketones. The interaction of 3,1-spirobenzoxazines with Vilsmeier-Haack reagent (POCl3 (PBr3)/DMF), depending on the amount of formulation agent, leads to the formation of hydroacridones or hydroacridines. Under catalyst- and additive-free conditions, N-arylmaleimides, like Michael's acceptors, are added to the hydroacridines in DMSO to form the corresponding adducts. The reaction proceeds stereoselectively with the formation of a mirror pair of diastereomers, if the products

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22

Feng, Xiujuan, Haixia Zhang, Wenbo Lu, et al. "Stereoselective Synthesis of Vinyl Iodides through Copper(I)-Catalyzed Finkelstein-Type Halide-Exchange Reaction." Synthesis 49, no. 12 (2017): 2727–32. http://dx.doi.org/10.1055/s-0036-1588988.

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An efficient method for the stereoselective synthesis of vinyl iodides is described. The reactions of vinyl bromides with potassium iodide proceed smoothly in the presence of a copper catalyst under mild reaction conditions to produce the corresponding vinyl iodides stereospecifically and in satisfactory to excellent yields.

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23

Darvesh, Sultan, Andrew S. Grant, David I. Magee, and Zdenek Valenta. "An approach to the synthesis of bruceantin. The synthesis of a tetracyclic intermediate." Canadian Journal of Chemistry 67, no. 12 (1989): 2237–40. http://dx.doi.org/10.1139/v89-348.

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An intermediate (20) containing four of the five rings and seven of the ten chiral centers of bruceantin (1) was prepared. In a key reaction, 3-iodo-1-trimethylsilyl-5-hexen-1-yne (9) was found to add chemoselectively and stereoselectively to a dianion. The sequence also includes a selective attack by a sulfinate (17) on the terminal acetylene C-atom of the dianion of a keto acetylene, a concomitant cyclization in which the acetylene acts as an electrophile, and the use of the resulting allyl sulfoxide for the introduction of oxygen functionality by a reductive rearrangement. Keywords: brucean

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24

Singh, Nidhi, and Jaya Pandey. "Advances in Henry Reaction: A Versatile Method in Organic Synthesis." Mini-Reviews in Organic Chemistry 17, no. 3 (2020): 297–308. http://dx.doi.org/10.2174/1570193x16666190214150144.

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: Henry reaction is an important reaction employing carbonyls which furnishes β-nitro alcohol, nitroalkene, α-nitro ketones, β-amino alcohol as products and byproducts that may be transfigured as building blocks for other synthetic reactions. This paper focuses on various synthetic routes for Henry reaction, a versatile reaction of high significance in organic synthesis. The paper discusses the chemistry and plausible products of the reaction, along with the various available synthetic routes for the same, ranging from classical conventional methods to modern methods of green chemistry trends.

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25

Clark, J. Stephen, and Michael Popadynec. "Stereoselective Synthesis of the I–L Fragment of the Pacific Ciguatoxins." Toxins 12, no. 12 (2020): 740. http://dx.doi.org/10.3390/toxins12120740.

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The I–L ring system found in all the Pacific ciguatoxins has been prepared from a tricyclic precursor in a highly stereoselective manner. Subtle differences in the reactivity of the enones present in the seven- and eight-membered rings of the tricyclic ether starting material have been exploited to allow selective protection of the enone in the eight-membered ring. Subsequent distereoselective allylation of the seven-membered ring has been accomplished by a palladium-mediated Tsuji-Trost reaction. The K-ring methyl and hydroxyl groups have been installed in a highly stereoselective manner by s

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26

Tarui, Atsushi, Yukiko Karuo, Kazuyuki Sato, Kentaro Kawai та Masaaki Omote. "Stereoselective Synthesis of Multisubstituted α-fluoro-β-lactams". Current Organic Chemistry 24, № 18 (2020): 2169–80. http://dx.doi.org/10.2174/1385272824666200221114707.

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β-Lactams, found in β -lactam antibiotics, are the structurally distorted cyclic compounds being subjected to nucleophilic acyl substitution reaction. α-Fluorination of β -lactams is a simple and expedient approach to control the reactivity of β-lactam ring toward nucleophilic attack, which would hopefully lead to the new design of future antibiotics. From the viewpoint of obtaining multisubstituted α -fluoro-β-lactams, α -bromo-α- fluoro-β-lactams are considered as key compounds for structure functionalization, including nucleophilic substitution reaction, aldol-type reaction and metal-cataly

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27

Baikadi, Karunakar, Anil Talakokkula, and A. Narsaiah. "Stereoselective Total Synthesis of Macrolide Sch-725674 and C-7-epi-Sch-725674." SynOpen 03, no. 01 (2019): 26–35. http://dx.doi.org/10.1055/s-0037-1611665.

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The stereoselective total synthesis of Sch-725674 in 14 linear synthetic steps with 10.3% overall yield is described. The synthesis started from commercially available starting materials, d-ribose and (R)-benzyl glycidol. The key reactions involved CBS reduction, Julia–Kocienski olefination, Horner–Wadsworth–Emmons reaction, and Shiina macrolactonization.

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28

Soorukram, Darunee, Manat Pohmakotr, Chutima Kuhakarn, and Vichai Reutrakul. "Stereoselective Synthesis of Tetrahydrofuran Lignans." Synthesis 50, no. 24 (2018): 4746–64. http://dx.doi.org/10.1055/s-0037-1610289.

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This short review aims to summarize the reports on stereoselective synthesis of naturally occurring tetrahydrofuran lignans published during the period of 2006 to 2018. The stereoselective construction of non-natural tetrahydrofuran frameworks is not included in this review.1 Introduction2 Stereoselective Synthesis of 2,5-Diaryltetrahydrofuran (CL5-a)2.1 Synthesis of CL5-a via Friedel–Crafts Arylation or Nucleophilic Addition/Reduction of γ-Butyrolactones2.2 Synthesis of CL5-a via Intramolecular Cyclization of 1,4-Diarylbutanediols2.3 Synthesis of CL5-a via Diastereoselective Hydrogenation of

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29

Khrimyan, Ashot P., Oganes A. Gharibyan, Ludvík Streinz, Zdeněk Wimmer, Miroslav Romaňuk та Shaliko O. Badanyan. "The hydroalumination-iodination of enyne α-alcohols: Synthesis of 3-methyl-2,4-alkadien-1-ols". Collection of Czechoslovak Chemical Communications 54, № 12 (1989): 3284–93. http://dx.doi.org/10.1135/cccc19893284.

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It has been found that the reaction course of hydroalumination-iodination using 2-methyl-5-hexen-3yn-2-ol and (6E)-9,13-dimethyl-6,12-tetradecadien-4-yn-3-ol as substrates is ambiguous. The subsequent reaction of lithium dimethyl cuprate with iodo dienols unlike that of iodo alkenols is non-stereoselective. These reactions have been used for the synthesis of a juvenile hormone mimic (4E, 6E)-5,9,13-trimethyl-4,6,12-tetradecatrien-3-ol.

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Karak, Milandip, Luiz C. A. Barbosa, Jaime A. M. Acosta, Ariel M. Sarotti, and John Boukouvalas. "Thermodynamically driven, syn-selective vinylogous aldol reaction of tetronamides." Organic & Biomolecular Chemistry 14, no. 21 (2016): 4897–907. http://dx.doi.org/10.1039/c6ob00895j.

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31

Grigg, Ronald, Suren Husinec, and Vladimir Savic. "Stereoselective cyclo-addition reactions of azomethine ylides catalysed by in situ generated Ag(I)/bisphosphine complexes." Journal of the Serbian Chemical Society 75, no. 1 (2010): 1–9. http://dx.doi.org/10.2298/jsc1001001g.

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Stereoselective cyclo-addition reactions of azomethine ylides promoted by in situ generated Ag(I)/bisphosphine complexes were studied. Under the optimized conditions, the pyrrolidine products were isolated in up to 84 % yield and with up to 71% e.e. The effects of various reaction variables on the stereoselectivity were also investigated.

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32

Liu, Yingchun, Ted S. Sorensen, and Fang Sun. "Stereoselective 1,3-debromination reactions." Canadian Journal of Chemistry 71, no. 2 (1993): 258–62. http://dx.doi.org/10.1139/v93-037.

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The metallate, PPN+Cr(CO)4NO−, was used for the 1,3-debrominative reductive cyclization of the (±) and meso isomers of dimethyl 2,4-dibromoglutarate and dimethyl 2,4-dibromo-2,4-dimethylglutarate. In both (±) isomers, the reaction is stereospecific in giving the trans cyclopropane product. In the meso case, the reaction is unselective in the first case, but distinctly favors the cis cyclopropane isomer in the second set of compounds. This (±) and meso pair thus represent the first example of near stereospecificity in the debrominations of both 1,3-dibromo diastereomers. Using an enantiomerical

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33

Nisith, Bhunia, and Das Biswanath. "Stereoselective total synthesis of seimatopolide A." Journal of Indian Chemical Society Vol. 90, Oct 2013 (2013): 1633–42. https://doi.org/10.5281/zenodo.5791638.

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Natural Product Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 607, India <em>E-mail </em>: biswanathdas@yahoo.com        Fax : 91-040-27193198 <em>Manuscript received 12 June 2013, accepted 13 June 2013</em> Stereoselective total synthesis of the naturally occurring bioactive macrolide, seimatopolide A has been achieved starting from commercially available (+)-diethyl tartrate. Chelation-controlled Grignard reaction, Yamaguchi esterification, ring closing cross metathesis and CBS reduction reactions are involved as key steps.  

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34

Aitouna, Abdelhak Ouled, Ali Barhoumi, and Abdellah Zeroual. "A Mechanism Study and an Investigation of the Reason for the Stereoselectivity in the [4+2] Cycloaddition Reaction between Cyclopentadiene and Gem-substituted Ethylene Electrophiles." Scientiae Radices 2, no. 3 (2023): 217–28. http://dx.doi.org/10.58332/scirad2023v2i3a01.

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The Molecular Electron Density Theory is applied to the [4+2] cycloaddition reaction between cyclopentadiene and gem-substituted ethylene electrophiles. Calculations are made for reactions, activation energies, and reactivity indices. The results of the experiment are perfectly consistent with activation energies, which unequivocally show that this cyclization’s are is highly stereoselective, in addition, based on ELF examination, the mechanism of these [4+2] cycloadditions occurs in two phases, The mechanisms of these reactions demonstrate that the term "pericyclic reaction" is no more releva

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35

Soto, Martín, Irene Sanz-Machín, Humberto Rodríguez-Solla, and Vicente Gotor-Fernández. "Chemoenzymatic Stereoselective Synthesis of trans-Flavan-4-ols via Lipase-Catalyzed Kinetic Resolutions." Catalysts 11, no. 11 (2021): 1296. http://dx.doi.org/10.3390/catal11111296.

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Flavan-4-ols are a subclass of flavonoids that are present in complex molecules with application in the industrial sector as pigments, antioxidants, or antimitotics, among many others. The most traditional way to achieve their synthesis is from naturally abundant flavanones, asymmetric transfer hydrogenation reactions or bioreduction being well known strategies, while their preparation from racemic flavan-4-ols has been less explored. In this article, we have focused on the synthesis of a series of trans-flavan-4-ols bearing different substitution patterns in the aromatic ring to explore later

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Busfield, WK, DI Grice, ID Jenkins, and SH Thang. "Reaction of t-Butoxy Radicals With Cyclic Alkenes Studied by the Nitroxide Radical-Trapping Technique." Australian Journal of Chemistry 44, no. 10 (1991): 1407. http://dx.doi.org/10.1071/ch9911407.

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The pattern of reactions occurring between t- butoxy radicals and a number of cyclic alkenes has been investigated by the nitroxide radical-trapping technique. The major reaction pathway is allylic abstraction unless this position is at a bridgehead as in norbornene where the major pathway is radical addition. The technique is sufficiently sensitive to identify minor reaction pathways of non-allylic substitution and radical addition when in the presence of extensive allylic substitution. Some stereoselective effects are also detected.

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37

Varga, Eszter, László Tamás Mika, Antal Csámpai, Tamás Holczbauer, György Kardos, and Tibor Soós. "Mechanistic investigations of a bifunctional squaramide organocatalyst in asymmetric Michael reaction and observation of stereoselective retro-Michael reaction." RSC Advances 5, no. 115 (2015): 95079–86. http://dx.doi.org/10.1039/c5ra19593d.

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The mechanism of cinchona–squaramide organocatalytic Michael addition was studied usingin situIR and NMR experiments. As a result, not only kinetic parameters were determined but a stereoselective retro-Michael reaction was also observed.

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38

Gualandi, Andrea, Luca Mengozzi, and Pier Cozzi. "Stereoselective SN1-Type Reaction of Enols and Enolates." Synthesis 49, no. 15 (2017): 3433–43. http://dx.doi.org/10.1055/s-0036-1588871.

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Stereoselective alkylation of enolates represents a valuable and important procedure for accessing carbon–carbon-bond frameworks in natural and nonnatural product synthesis. Usually, activated electrophilic partners that react through an SN2 mechanism are employed. To overcome the limitations due to reduced reactivity and steric hindrance, SN1-type reactions can be considered a valid and practical alternative. Accessible enolates can be used in stereoselective (diastereo- or enantioselective) reactions with electrophilic carbenium ions, either used as stable reagents or generated in situ from

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39

Elinson, M. N., A. N. Vereshchagin, R. F. Nasybullin, et al. "General approach to a spiro indole-3,1′-naphthalene tetracyclic system: stereoselective pseudo four-component reaction of isatins and cyclic ketones with two molecules of malononitrile." RSC Advances 5, no. 62 (2015): 50421–24. http://dx.doi.org/10.1039/c5ra03452c.

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40

SANO, Shigeki. "Development of Highly Stereoselective Reactions Utilizing Heteroatoms : New Approach to the Stereoselective Horner-Wadsworth-Emmons Reaction." YAKUGAKU ZASSHI 120, no. 5 (2000): 432–44. http://dx.doi.org/10.1248/yakushi1947.120.5_432.

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41

Singh, Surinderjit, M. PS Ishar, Gajendra Singh, and Rajinder Singh. "Efficient, microwave-assisted intramolecular 1,3-dipolar cycloadditions of oximes and N-methylnitrones derived from o-alkenylmethoxy-acetophenones." Canadian Journal of Chemistry 83, no. 3 (2005): 260–65. http://dx.doi.org/10.1139/v05-049.

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Contrary to literature reports, the o-allyloxy- and crotyloxy-acetophenone-oximes (2a, 2b) are transformed to nitrones, which undergo regio- and stereoselective intramolecular 1,3-dipolar cycloadditions, both on microwave heating under solvent free conditions and refluxing in toluene, to afford novel cycloadducts (5a, 5b); the oxazepine-N-oxide (3a) reported to be formed in 98% yield was obtained only as a minor product (~10%). However, o-cinnamyloxy-acetophenone-oxime (2c) under similar conditions undergoes intramolecular N-alkylation to afford nitrone (3c). The reactions carried out under mi

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42

Andreev, Mikhail V., Vladimir A. Potapov, Maxim V. Musalov, and Lyudmila I. Larina. "A New Family of Vinyl Selenocyanates with the Amide Function Based on the Reaction of Potassium Selenocyanate with 3-Trimethylsilyl-2-Propynamides." Catalysts 13, no. 9 (2023): 1257. http://dx.doi.org/10.3390/catal13091257.

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An efficient approach to a novel family of (Z)-3-amino-3-oxo-1-propenyl selenocyanates was developed based on the reaction of KSeCN with 3-trimethylsilyl-2-propynamides in the presence of ammonium chloride in methanol. The reaction was accompanied by a desilylation process. The products were not formed under the same reaction conditions in the absence of ammonium chloride, which was used for the first time in the reactions of selenocyanates with acetylenes. The use of this new methodology allowed the reaction to carry out in a regio- and stereoselective fashion as anti-addition affording vinyl

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43

Marin, Lucile, Soufyan Jerhaoui, Emilie Kolodziej, et al. "Sulfoxide‐Controlled Stereoselective Aza‐Piancatelli Reaction." Advanced Synthesis & Catalysis 363, no. 17 (2021): 4277–82. http://dx.doi.org/10.1002/adsc.202100848.

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44

Baba, A., S. Babu, M. Yasuda, Y. Okabe, and I. Shibata. "Stereoselective Reformatsky Reaction of Indium Enolates." Synfacts 2006, no. 9 (2006): 0930. http://dx.doi.org/10.1055/s-2006-949268.

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45

Rama Rao, K., T. N. Srinivasan, and N. Bhanumathi. "A stereoselective biocatalytic diels-alder reaction." Tetrahedron Letters 31, no. 41 (1990): 5959–60. http://dx.doi.org/10.1016/s0040-4039(00)98004-3.

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46

Byk, G., and E. Kabha. "A Solid-Supported Stereoselective Multicomponent Reaction." Synfacts 2006, no. 7 (2006): 0739. http://dx.doi.org/10.1055/s-2006-941902.

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47

Bauer, Adriano, and Nuno Maulide. "A Stereoselective Reductive Hosomi–Sakurai Reaction." Organic Letters 20, no. 5 (2018): 1461–64. http://dx.doi.org/10.1021/acs.orglett.8b00276.

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48

Kapa, Prasad, Chen Kau-Ming, Repic Oljan, and Hardtmann E. Goetz. "Stereoselective aldol reaction with chiral acetates." Tetrahedron: Asymmetry 1, no. 10 (1990): 703–6. http://dx.doi.org/10.1016/s0957-4166(00)82378-2.

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49

Roy, Tamal, Myungjo J. Kim, Yang Yang, et al. "Carbon Dioxide-Catalyzed Stereoselective Cyanation Reaction." ACS Catalysis 9, no. 7 (2019): 6006–11. http://dx.doi.org/10.1021/acscatal.9b01087.

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50

Gabdullin, A. M., R. N. Kadikova, and I. R. Ramazanov. "Cp2ZrCl2-EtMgBr-Catalysed Reaction of 2-Zincoethylzincation of 2-Alkynylamines." Žurnal organičeskoj himii 60, no. 1 (2024): 68–74. https://doi.org/10.31857/s0514749224010056.

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It was found that the Cp2ZrCl2-EtMgBr-catalyzed reaction of 2-alkynylamines with Et2Zn leads to the regio- and stereoselective formation of (2Z)-allylamines in high yield. It has been established that the presence of morpholyl and piperidyl substituents in the structure of propargylamines does not interfere with the regio- and stereoselective 2-zincoethylzincation of the triple bond. Carbocyclization of α,ω-bis(aminomethyl)alkadiynes based on the Cp2ZrCl2-EtMgBr-catalyzed carbozincation reaction with Et2Zn was carried out for the first time. A mechanism for the catalytic 2-zincoethylzincation

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