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Journal articles on the topic 'Formation of C-N bonds'

Author: Grafiati

Published: 25 May 2024

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1

Meng, Ge, Pengfei Li, Kai Chen, and Linghua Wang. "Recent Advances in Transition-Metal-Free Aryl C–B Bond Formation." Synthesis 49, no. 21 (2017): 4719–30. http://dx.doi.org/10.1055/s-0036-1590913.

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Arylboronic acids and their derivatives are widely used in organic synthesis. Conventional methods for their preparation require either reactive organometallic reagents or transition-metal-mediated processes. In recent years, transition-metal-free reactions for aryl C–B bond formation that obviate preformed organometallic reagents have gained interest and have developed rapidly. These new reactions have shown significant advantages for the preparation of functionalized molecules. In this review, an overview of the recent advances in transition-metal-free aromatic borylation reactions is provid

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2

Zeng, Xiaoming, and Xuefeng Cong. "Chromium-Catalyzed Cross-Coupling Reactions by Selective Activation of Chemically Inert Aromatic C–O, C–N, and C–H Bonds." Synlett 32, no. 13 (2021): 1343–53. http://dx.doi.org/10.1055/a-1507-4153.

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AbstractTransition-metal-catalyzed cross-coupling has emerged as one of the most powerful and useful tools for the formation of C–C and C–heteroatom bonds. Given the shortage of resources of precious metals on Earth, the use of Earth-abundant metals as catalysts in developing cost-effective strategies for cross-coupling is a current trend in synthetic chemistry. Compared with the achievements made using first-row nickel, iron, cobalt, and even manganese catalysts, the group 6 metal chromium has rarely been used to promote cross-coupling. This perspective covers recent advances in chromium-cata

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3

Henry, Martyn, Mohamed Mostafa, and Andrew Sutherland. "Recent Advances in Transition-Metal-Catalyzed, Directed Aryl C–H/N–H Cross-Coupling Reactions." Synthesis 49, no. 20 (2017): 4586–98. http://dx.doi.org/10.1055/s-0036-1588536.

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Amination and amidation of aryl compounds using a transition-metal-catalyzed cross-coupling reaction typically involves prefunctionalization or preoxidation of either partner. In recent years, a new class of transition-metal-catalyzed cross-dehydrogenative coupling reaction has been developed for the direct formation of aryl C–N bonds. This short review highlights the substantial progress made for ortho-C–N bond formation via transition-metal-catalyzed chelation-directed aryl C–H activation and gives an overview of the challenges that remain for directed meta- and para-selective reactions.1 In

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4

Chang, Denghu, Dan Zhu, Peng Zou, and Lei Shi. "Cleavage of C–N bonds in guanidine derivatives and its relevance to efficient C–N bonds formation." Tetrahedron 71, no. 11 (2015): 1684–93. http://dx.doi.org/10.1016/j.tet.2015.01.050.

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5

Wang, Congyang, and Ting Liu. "Manganese-Catalyzed C(sp2)–H Addition to Polar Unsaturated Bonds." Synlett 32, no. 13 (2021): 1323–29. http://dx.doi.org/10.1055/a-1468-6136.

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AbstractTransition-metal-catalyzed nucleophilic C–H addition of hydrocarbons to polar unsaturated bonds could intrinsically avoid prefunctionalization of substrates and formation of waste byproducts, thus featuring high step- and atom-economy. As the third most abundant transition metal, manganese-catalyzed C–H addition to polar unsaturated bonds remains challenging, partially due to the difficulty in building a closed catalytic cycle of manganese. In the past few years, we have developed manganese catalysis to enable the sp2-hydrid C–H addition to polar unsaturated bonds (e.g., imines, aldehy

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6

Rit, Raja K., Majji Shankar, and Akhila K. Sahoo. "C–H imidation: a distinct perspective of C–N bond formation." Organic & Biomolecular Chemistry 15, no. 6 (2017): 1282–93. http://dx.doi.org/10.1039/c6ob02162j.

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7

Zinser, Caroline M., Katie G. Warren, Fady Nahra, et al. "Palladate Precatalysts for the Formation of C–N and C–C Bonds." Organometallics 38, no. 14 (2019): 2812–17. http://dx.doi.org/10.1021/acs.organomet.9b00326.

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8

Wei, Wenting, Wenming Zhu, Yi Wu, Yiling Huang, and Hongze Liang. "Progress in C—N Bonds Formation Using t-BuONO." Chinese Journal of Organic Chemistry 37, no. 8 (2017): 1916. http://dx.doi.org/10.6023/cjoc201703039.

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9

Zhao, Binlin, Torben Rogge, Lutz Ackermann, and Zhuangzhi Shi. "Metal-catalysed C–Het (F, O, S, N) and C–C bond arylation." Chemical Society Reviews 50, no. 16 (2021): 8903–53. http://dx.doi.org/10.1039/c9cs00571d.

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10

Sun, Qiu, Ling He, Jiaxin Cheng, Ze Yang, Yuansheng Li, and Yulan Xi. "Synthesis of Isoxazolines and Isoxazoles via Metal-Free Desulfitative Cyclization." Synthesis 50, no. 12 (2018): 2385–93. http://dx.doi.org/10.1055/s-0037-1609480.

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A novel, one-pot reaction for the synthesis of isoxazolines and isoxazoles is developed via a cascade process under metal-free conditions. The approach involves the formation of intramolecular C–N and C–O bonds and intermolecular C–C bonds from aromatic alkenes or alkynes and N-hydroxysulfonamides using hypervalent iodine(VII) and iodine as the oxidant. Activation of C–H and C–C bonds/construction of C–O bonds/elimination of SO2/C–N bond formation is achieved in sequence in the reaction system.

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11

Chang, Denghu, Dan Zhu, Peng Zou, and Lei Shi. "ChemInform Abstract: Cleavage of C-N Bonds in Guanidine Derivatives and Its Relevance to Efficient C-N Bonds Formation." ChemInform 46, no. 27 (2015): no. http://dx.doi.org/10.1002/chin.201527078.

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12

Borpatra, Paran J., Bhaskar Deka, Mohit L. Deb, and Pranjal K. Baruah. "Recent advances in intramolecular C–O/C–N/C–S bond formation via C–H functionalization." Organic Chemistry Frontiers 6, no. 20 (2019): 3445–89. http://dx.doi.org/10.1039/c9qo00863b.

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13

Li, Ying-Xiu, Ke-Gong Ji, Hai-Xi Wang, Shaukat Ali, and Yong-Min Liang. "Iodine-Induced Regioselective C−C and C−N Bonds Formation ofN-Protected Indoles." Journal of Organic Chemistry 76, no. 2 (2011): 744–47. http://dx.doi.org/10.1021/jo1023014.

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14

Sun, Kai, Fengji Ma, Lulu Liu, et al. "Iodine-mediated regioselective C–N and C–I bond formation of alkenes." RSC Advances 5, no. 100 (2015): 82492–95. http://dx.doi.org/10.1039/c5ra14407h.

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Iodine mediated intermolecular C–N and C–I bonds formation of alkenes was realized. A series of alkenes could be converted into the aminoiodination products, which are versatile building blocks in organic synthesis and medicinal chemistry.

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15

Li, Ying-Xiu, Ke-Gong Ji, Hai-Xi Wang, Shaukat Ali, and Yong-Min Liang. "ChemInform Abstract: Iodine-Induced Regioselective C-C and C-N Bonds Formation of N-Protected Indoles." ChemInform 42, no. 16 (2011): no. http://dx.doi.org/10.1002/chin.201116105.

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16

Schranck, Johannes, Anis Tlili, and Matthias Beller. "More Sustainable Formation of CN and CC Bonds for the Synthesis of N-Heterocycles." Angewandte Chemie International Edition 52, no. 30 (2013): 7642–44. http://dx.doi.org/10.1002/anie.201303015.

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17

Xu, Da-Zhen, Ren-Ming Hu, and Yi-Huan Lai. "Iron-Catalyzed Aerobic Oxidative Cross-Dehydrogenative C(sp3)–H/X–H (X = C, N, S) Coupling Reactions." Synlett 31, no. 18 (2020): 1753–59. http://dx.doi.org/10.1055/s-0040-1707195.

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The direct functionalization of C(sp3)–H bonds is an attractive research topic in organic synthetic chemistry. The cross-dehydrogenative coupling (CDC) reaction provides a simple and powerful tool for the construction of C–C and C–heteroatom bonds. Recently, some progress has been made in the iron-catalyzed aerobic oxidative CDC reactions. Here, we present recent developments in the direct functionalization of C(sp3)–H bonds catalyzed by simple iron salts with molecular oxygen as the terminal oxidant.1 Introduction2 C(sp3)–C Bond Formation3 C(sp3)–N Bond Formation4 C(sp3)–S(Se) Bond Formation5

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18

Fioravanti, Stefania, M. Antonietta Loreto, Lucio Pellacani, and Paolo A. Tardella. "Asymmetric formation of CN bonds in chiral enol ethers." Tetrahedron 47, no. 30 (1991): 5877–82. http://dx.doi.org/10.1016/s0040-4020(01)86538-8.

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19

Chen, Tieqiao, Li-Biao Han, Qihang Tan, Xue Liu, Long Liu, and Tianzeng Huang. "Phosphorylation of Carboxylic Acids and Their Derivatives with P(O)–H Compounds Forming P(O)–C Bonds." Synthesis 53, no. 01 (2020): 95–106. http://dx.doi.org/10.1055/s-0040-1707286.

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AbstractHerein, we highlight advances in the phosphorylation of readily available carboxylic acids and their derivatives forming synthetically important P(O)–sp3C, P(O)–sp2C, and P(O)–spC bonds, with an emphasis on the results demonstrated since 2010. This review examines the challenges associated with the use of this strategy for the synthesis of organophosphorus compounds and details advances in the design of catalytic systems that suppress these problems thus resulting in notable progress. Mechanistic details are discussed where available.1 Introduction2 Formation of P(O)–sp3C Bonds3 Format

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20

Mitrofanov, Alexander Yu, Arina V. Murashkina, Iris Martín-García, Francisco Alonso, and Irina P. Beletskaya. "Formation of C–C, C–S and C–N bonds catalysed by supported copper nanoparticles." Catalysis Science & Technology 7, no. 19 (2017): 4401–12. http://dx.doi.org/10.1039/c7cy01343d.

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21

Xu, Yulong, Xiaonan Shi, and Lipeng Wu. "tBuOK-triggered bond formation reactions." RSC Advances 9, no. 41 (2019): 24025–29. http://dx.doi.org/10.1039/c9ra04242c.

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22

Lv, Zongchao, Huamin Wang, Zhicong Quan, Yuan Gao, and Aiwen Lei. "Dioxygen-triggered oxidative cleavage of the C–S bond towards C–N bond formation." Chemical Communications 55, no. 82 (2019): 12332–35. http://dx.doi.org/10.1039/c9cc05707b.

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23

Yi, Xiangyan, Jiajun Feng, Fei Huang, and Jonathan Bayldon Baell. "Metal-free C–C, C–O, C–S and C–N bond formation enabled by SBA-15 supported TFMSA." Chemical Communications 56, no. 8 (2020): 1243–46. http://dx.doi.org/10.1039/c9cc08389h.

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The intermolecular C–C, C–O, C–S and C–N bonds construction between diazo compounds and acyclic, cyclic 1,3-dicarbonyl compounds, thiophenol, alkynes were developed by using a TFMSA@SBA-15, providing a metal-free and eco-friendly platform.

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24

Puerto Galvis, Carlos, та Vladimir Kouznetsov. "Recent Advances for the C–C and C–N Bond Formation in the Synthesis of 1-Phenethyl-tetrahydroisoquinoline, Aporphine, Homoaporphine, and β-Carboline Alkaloids". Synthesis 49, № 20 (2017): 4535–61. http://dx.doi.org/10.1055/s-0036-1589512.

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Among the existing methods for the synthesis of bioactive and/or complex small molecules, organic transformations such as C–C and C–N bond formation have been significantly developed and exploited for the synthesis of diverse synthetic and natural fused aza-polycycles. The abundance and biological and physical activities of 1-phenethyl-tetrahydroisoquinolines, aporphines, homoaporphines, and β-carbolines have inspired many organic chemists to seek sustainable and efficient protocols for their preparation. However, these methodologies involve multiple steps and in most cases the key reaction st

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25

Song, Chunlan, Kun Liu, Xin Dong, Chien-Wei Chiang, and Aiwen Lei. "Recent Advances in Electrochemical Oxidative Cross-Coupling for the Construction of C–S Bonds." Synlett 30, no. 10 (2019): 1149–63. http://dx.doi.org/10.1055/s-0037-1611753.

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With the importance of sulfur-containing organic molecules, developing methodologies toward C–S bond formation is a long-standing goal, and, to date, considerable progress has been made in this area. Recent electrochemical oxidative cross-coupling reactions for C–S bond formation allow the synthesis of sulfur-containing molecules from more effective synthetic routes with high atom economy under mild conditions. In this review, we highlight the vital progress in this novel research arena with an emphasis on the synthetic and mechanistic aspects of the organic electrochemistry reactions.1 Introd

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26

Subaramanian, Murugan, Ganesan Sivakumar, and Ekambaram Balaraman. "Recent advances in nickel-catalyzed C–C and C–N bond formation via HA and ADC reactions." Organic & Biomolecular Chemistry 19, no. 19 (2021): 4213–27. http://dx.doi.org/10.1039/d1ob00080b.

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In this review article, recent advances in nickel-catalyzed hydrogen auto-transfer (HA) and acceptorless dehydrogenative coupling (ADC) reactions for the construction of C–C and C–N bonds have been discussed.

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27

Schranck, Johannes, Anis Tlili, and Matthias Beller. "ChemInform Abstract: More Sustainable Formation of C-N and C-C Bonds for the Synthesis of N-Heterocycles." ChemInform 44, no. 40 (2013): no. http://dx.doi.org/10.1002/chin.201340248.

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28

Zheng, Hui, Qiaoyue Shi, Kui Du, Xianting Cao, and Pengfei Zhang. "Chemoenzymatic selective formation of C–N bonds in a benzimidazole heterocycle." RSC Advances 3, no. 47 (2013): 24959. http://dx.doi.org/10.1039/c3ra43982h.

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29

Zhang, Honghua, Huihong Wang, Yi Jiang, et al. "Recent Advances in Iodine‐Promoted C−S/N−S Bonds Formation." Chemistry – A European Journal 26, no. 72 (2020): 17289–317. http://dx.doi.org/10.1002/chem.202001414.

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30

Ngah, Nurziana, Nor Azanita Mohamed, Bohari M. Yamin, and Hamizah Mohd Zaki. "3-[3-(2-Fluorobenzoyl)thioureido]propionic acid." Acta Crystallographica Section E Structure Reports Online 70, no. 6 (2014): o705. http://dx.doi.org/10.1107/s1600536814011404.

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In the title compound, C10H11FN3O3S, the 2-fluorobenzoyl and proponic acid groups maintain atrans–cisconformation with respect to the thiono C=S bond across their C—N bonds. The propionic acid group adopts ananticonformation about the C—C bond, with an N—C—C—C torsion angle of 173.8 (2)°. The amino groups are involved in the formation of intramolecular N—H...O and N—H...F hydrogen bonds. In the crystal, pairs of O—H...O hydrogen bonds link molecules into inversion dimers.

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31

Kamer, Paul C. J., Gino P. F. van Strijdonck, Joost N. H. Reek, and Piet W. N. M. van Leeuwen. "ChemInform Abstract: Hydroformylation and Hydroxycarbonylation of Alkenes: Formation of C-N and C-C Bonds." ChemInform 33, no. 49 (2010): no. http://dx.doi.org/10.1002/chin.200249213.

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32

Duan, Jindian, Yuyu Cheng, Rou Li, and Pengfei Li. "Synthesis of spiro[indane-1,3-dione-1-pyrrolines] via copper-catalyzed heteroannulation of ketoxime acetates with 2-arylideneindane-1,3-diones." Organic Chemistry Frontiers 3, no. 12 (2016): 1614–18. http://dx.doi.org/10.1039/c6qo00454g.

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A cuprous cyanide-catalyzed heteroannulation reaction of 2-arylideneindane-1,3-dione with ketoxime acetates has been developed for the synthesis of novel spiro[indane-1,3-dione-1-pyrrolines] through the cleavage of N–O and C–H bonds and formation of C–C and C–N bonds.

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33

Desnoyer, Addison N., and Jennifer A. Love. "Recent advances in well-defined, late transition metal complexes that make and/or break C–N, C–O and C–S bonds." Chemical Society Reviews 46, no. 1 (2017): 197–238. http://dx.doi.org/10.1039/c6cs00150e.

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34

Liu, Yichang, Liwei Xue, Biyin Shi, et al. "Catalyst-free electrochemical decarboxylative cross-coupling of N-hydroxyphthalimide esters and N-heteroarenes towards C(sp3)–C(sp2) bond formation." Chemical Communications 55, no. 99 (2019): 14922–25. http://dx.doi.org/10.1039/c9cc08528a.

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We formed C(sp<sup>3</sup>)–C(sp<sup>2</sup>) bonds under electrochemical conditions by using NHP esters and N-heteroarenes without any catalysts. Our approach could be a complement to the Kolbe reaction and a promising strategy for finding more new reactions.

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35

Sud, Abhishek, Pramod S. Chaudhari, Ishu Agarwal, Amjad Basha Mohammad, Vilas H. Dahanukar, and Rakeshwar Bandichhor. "Discovery of redox system enabling C–N–C bonds formation: Unprecedented Aza-Cannizzaro reaction." Tetrahedron Letters 58, no. 19 (2017): 1891–94. http://dx.doi.org/10.1016/j.tetlet.2017.04.010.

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36

Leclerc, Matthew C., Bulat M. Gabidullin, Jason G. Da Gama, et al. "Transition-Metal-Free Formation of C–E Bonds (E = C, N, O, S) and Formation of C–M Bonds (M = Mn, Mo) from N-Heterocyclic Carbene Mediated Fluoroalkene C–F Bond Activation." Organometallics 36, no. 4 (2017): 849–57. http://dx.doi.org/10.1021/acs.organomet.6b00908.

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37

Ovchynnikov, Vladimir. "N,N′-Dimethyl-N′′-(trichloroacetyl)phosphoramide." Acta Crystallographica Section E Structure Reports Online 69, no. 12 (2013): o1759. http://dx.doi.org/10.1107/s1600536813030389.

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In the title compound, C4H9Cl3N3O2P or CCl3C(O)NHP(O)(NHCH3)2, the P atom has a strongly distorted tetrahedral geometry due to the formation of intermolecular strong hydrogen bonds involving the N atoms. In the crystal, N—H...O=P and N—H...O=C hydrogen bonds connect the molecules into a two-dimensional array parallel to (100). An intramolecular P...O contact [P...O = 2.975 (3) Å] is observed. The CCl3group is rotationally disordered, with occupancies of 0.60 (3) and 0.40 (3)

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38

Brock, Carolyn Pratt. "Crystal packing in vicinal diols C n H m (OH)2." Acta Crystallographica Section B Structural Science 58, no. 6 (2002): 1025–31. http://dx.doi.org/10.1107/s010876810201981x.

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The O—H...O bonds in vic-diols C n H m (OH)2 have been studied using data retrieved from the Cambridge Structural Database. About half of these diols form complete, or almost complete, sets of intermolecular O—H...O bonds (i.e. two satisfied donors per molecule). For this half of the structures the frequencies of high-symmetry space groups and of structures with Z′ > 1 (more than one molecule in the asymmetric unit) are substantially elevated. The most common motif among fully bonded structures is an R_{\rm{2}}^{\rm{2}} {\rm{(10)}} dimer, which can be linked in a variety of ways to form one

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39

Luo, Shuang, Ziwei Hu, and Qiang Zhu. "Dearomative C–C and C–N bond cleavage of 2-arylindoles: transition-metal-free access to 2-aminoarylphenones." Organic Chemistry Frontiers 3, no. 3 (2016): 364–67. http://dx.doi.org/10.1039/c5qo00394f.

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A transition-metal-free conversion of 2-arylindoles to 2-aminoarylphenones, using environmentally benign O<sub>2</sub> as the sole oxidant, has been developed. This novel oxidative dearomatization process involves cleavage of two C–C and one C–N bonds followed by new C–C and C–O bond formation.

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40

Kang, Qing-Qing, Wenfeng Wu, Qiang Li, and Wen-Ting Wei. "Photochemical strategies for C–N bond formation via metal catalyst-free (hetero) aryl C(sp2)–H functionalization." Green Chemistry 22, no. 10 (2020): 3060–68. http://dx.doi.org/10.1039/d0gc01088j.

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41

Jin, Guanghua, C. Gunnar Werncke, Yannick Escudié, Sylviane Sabo-Etienne, and Sébastien Bontemps. "Iron-Catalyzed Reduction of CO2 into Methylene: Formation of C–N, C–O, and C–C Bonds." Journal of the American Chemical Society 137, no. 30 (2015): 9563–66. http://dx.doi.org/10.1021/jacs.5b06077.

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42

Tiritiris, Ioannis, and Willi Kantlehner. "Crystal structure ofN′′-benzyl-N′′-[3-(benzyldimethylazaniumyl)propyl]-N,N,N′,N′-tetramethylguanidinium bis(tetraphenylborate)." Acta Crystallographica Section E Crystallographic Communications 71, no. 12 (2015): o1086—o1087. http://dx.doi.org/10.1107/s2056989015024639.

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In the crystal structure of the title salt, C24H38N42+·2C24H20B−, the C—N bond lengths in the central CN3unit of the guanidinium ion are 1.3364 (13), 1.3407 (13) and 1.3539 (13) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charge is delocalized in the CN3plane. The bonds between the N atoms and the terminal methyl groups of the guanidinium moiety and the four C—N bonds to the central N atom of the (benzyldimethylazaniumyl)propyl group have single-bond character. In the crystal, C—H...π

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43

Chipanina, N. N., L. P. Oznobikhina, and N. F. Lazareva. "<i>n</i>-(chlorodimethylsilyl)methylated derivatives of <i>N</i>,<i>N</i>′-propyleneurea. ir spectra analysis and quantum-chemical calculations." Журнал общей химии 93, no. 5 (2023): 730–40. http://dx.doi.org/10.31857/s0044460x23050086.

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The IR spectra of N -silylmethylated derivatives of N , N ′-propyleneurea in solvents of different polarity were studied in a wide temperature range. The DFT method was used to perform quantum chemical calculations of geometric, energy and spectral characteristics of these compounds in isolated state (gas) and polar medium (DMSO). Analysis and comparison of these results made it possible to evaluate the influence of the environment on the criteria for the formation and strength of intramolecular dative C=O→Si bonds. The dependence of the dative bond О→Si and the order of the bonds C=O and C-N,

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44

FIORAVANTI, S., M. A. LORETO, L. PELLACANI, and P. A. TARDELLA. "ChemInform Abstract: Asymmetric Formation of C-N Bonds in Chiral Enol Ethers." ChemInform 22, no. 44 (2010): no. http://dx.doi.org/10.1002/chin.199144101.

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45

Weret, Misganaw Adigo, Chung-Feng Jeffrey Kuo, Wei-Nien Su, and Bing-Joe Hwang. "Revealing the Lithium Storage Mechanism of Sulfurized Polyacrylonitrile Cathode by Ex-Situ NMR and Ex-Situ Raman Spectroscopy." ECS Meeting Abstracts MA2023-01, no. 2 (2023): 605. http://dx.doi.org/10.1149/ma2023-012605mtgabs.

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Sulfurized polyacrylonitrile (SPAN) is a promising cathode material for high-performance lithium-sulfur batteries.1-3 However, fundamental insights into its molecular structure and lithium storage mechanism are yet not clearly understood. Herein, we reveal the formation of N-S and C=N-S bonds in addition to the C-S and S-S bonds using high−resolution cross−polarization/magic angle spinning (CP−MAS) solid states nitrogen-15 and carbon-13 nuclear magnetic resonance spectroscopy (15N NMR and 13C NMR). Ex-situ 13C NMR, ex-situ 15N NMR, ex-situ 7Li NMR, and ex-situ Raman studies indicate the format

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46

Currie, Lucy, Luca Rocchigiani, David L. Hughes, and Manfred Bochmann. "Carbon–sulfur bond formation by reductive elimination of gold(iii) thiolates." Dalton Transactions 47, no. 18 (2018): 6333–43. http://dx.doi.org/10.1039/c8dt00906f.

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47

Zheng, Yang, Jincheng Mao, Jie Chen, et al. "Unexpected CN bond formation via NaI-catalyzed oxidative de-tetra-hydrogenative cross-couplings between N,N-dimethyl aniline and sulfamides." RSC Advances 5, no. 62 (2015): 50113–17. http://dx.doi.org/10.1039/c5ra06773a.

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48

Petrova, M., R. Muhamadejev, B. Vigante, G. Duburs, and Edvards Liepinsh. "Intramolecular hydrogen bonds in 1,4-dihydropyridine derivatives." Royal Society Open Science 5, no. 6 (2018): 180088. http://dx.doi.org/10.1098/rsos.180088.

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1,4-Dihydropyridine (1,4-DHP) derivatives have been synthesized and characterized by 1 H, 13 C, 15 N nuclear magnetic resonance (NMR) spectroscopy, secondary proton/deuterium 13 C isotope shifts, variable temperature 1 H NMR experiments and quantum-chemical calculation. The intramolecular hydrogen bonds NH⋯O=C and CH⋯O=C in these compounds were established by NMR and quantum-chemical studies The downfield shift of the NH proton , accompanied by the upfield shift of the 15 N nuclear magnetic resonance signals, the shift to the higher wavenumbers of the NH stretching vibration in the infrared sp

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Guo, Qihang, and Zhan Lu. "Recent Advances in Nitrogen–Nitrogen Bond Formation." Synthesis 49, no. 17 (2017): 3835–47. http://dx.doi.org/10.1055/s-0036-1588512.

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Over the last decade, N–N bond formation as a synthetic strategy has emerged as a powerful key step in the construction of highly valuable heterocycles from easily obtained materials. This review focuses on recent methods used to build N–N bonds, classified by intra- and intermolecular reactions with various types of N–X (O, C, N, H) bond cleavage.1 I ntroduction2 Intramolecular N–N Bond Formation2.1 Cleavage of N–O Bonds2.2 Cleavage of N–C Bonds2.3 Cleavage of N–N Bonds2.4 Cleavage of N–H Bonds2.4.1 Construction of Pyrazole Derivatives2.4.2 Construction of Triazole Derivatives2.4.3 Constructi

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Jin, Guanghua, C. Gunnar Werncke, Yannick Escudie, Sylviane Sabo-Etienne, and Sebastien Bontemps. "ChemInform Abstract: Iron-Catalyzed Reduction of CO2into Methylene: Formation of C-N, C-O, and C-C Bonds." ChemInform 47, no. 4 (2016): no. http://dx.doi.org/10.1002/chin.201604164.

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