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Journal articles on the topic 'Pyrimido[1,2-a]benzoimidazole'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Donati, C., WK Janowski, RH Prager, MR Taylor, and LM Vilkins. "Base Catalyzed Rearrangement of Isoxazolinyl Heterocycles: Synthesis of Annelated Pyrimidines." Australian Journal of Chemistry 42, no. 12 (1989): 2161. http://dx.doi.org/10.1071/ch9892161.

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The rearrangement of a number of ethyl 2-(heterocyclic)-5-oxo-2,5-dihydroisoxazole-4-carb-oxylates by mild base is described, leading to new syntheses of the pyrimido [2,1-a] isoquinoline, pyrimido [1,2-a]quinoline, pyrimido [2,1-b] benzothiazole , pyrirnido [1,2-a] pyrimidine, pyrimido [1,2-b]pyridazine and pyrimido [1,2-c] quinazoline ring systems. A mechanism is suggested, and X-ray crystallographic evidence presented for the structure of one of the products, ethyl 2-hydroxy-4-oxo-4H-pyrimido[2,1-a]isoquinoline-3-carboxylate.

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2

Cao, Hong-Tao, Lei Ding, Guo-Gang Shan, Hai-Zhu Sun, Yong Wu, and Zhong-Min Su. "A sulfur-free iridium(iii) complex for highly selective and multi-signaling mercury(ii)-chemosensors." Dalton Transactions 44, no. 46 (2015): 19997–20003. http://dx.doi.org/10.1039/c5dt03129j.

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A sulfur-free iridium(iii) complex adopting the 1,2-diphenyl-1H-benzoimidazole ligand was successfully prepared, which showed high selectivity and sensitivity to Hg(ii) ions through optical and electrochemical signals.

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3

Dawood, Kamal M., Ahmad M. Farag, and Zaghloul E. Kandeel. "Heterocyclic Synthesis via Enaminonitriles: One-pot Synthesis of Some New Pyrazole, Isoxazole, Pyrimidine, Pyrazolo[1,5-a]pyrimidine, Pyrimido[1,2-a]benzimidazole and Pyrido[1,2-a]benzimidazole Derivatives." Journal of Chemical Research 23, no. 2 (1999): 88–89. http://dx.doi.org/10.1177/174751989902300211.

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4

Monier, Mohamed, Doaa Abdel-Latif, Ahmed El-Mekabaty, and Khaled M. Elattar. "Bicyclic 6 + 6 Systems: Advances in the Chemistry of Heterocyclic Compounds Incorporated Pyrimido[1,2-a]Pyrimidine Skeleton." Mini-Reviews in Organic Chemistry 17, no. 6 (2020): 717–39. http://dx.doi.org/10.2174/1389557519666190925161145.

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The present review has highlighted the chemistry of pyrimido[1,2-a]pyrimidine compounds as one of the most important classes of heterocyclic systems. The main sections include: (1) The synthesis of pyrimido[1,2-a]pyrimidines, (2) reactivity of the substituents attached to the carbon and nitrogen atoms of the ring and (3) biological applications. A discussion demonstrated that the proposed mechanisms of unexpected synthetic routes were intended. The purpose of this review is to provide an overview of the chemistry of pyrimido[1,2-a]pyrimidines to date, in which the compounds should be widely ap

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5

Al-Zaydi, Khadijah Mohamed, Mariam Abd Alha Al-Shiekh, and Ebtisam Abdel-Aziz Hafez. "Enaminonitriles in Heterocyclic Synthesis: New Routes for the Synthesis of Some Novel Azolo[1,5-a]pyrimidine, Pyrimido[1,2-a]benzimidazole, Pyrido[1,2-a]benimdazole, Pyrazolo[3,4-b]pyridine, Pyrazole and Pyrimidine Derivatives." Journal of Chemical Research 2000, no. 1 (2000): 13–15. http://dx.doi.org/10.3184/030823400103165716.

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6

Wen, Li-Li, Jing Yu, Hai-Zhu Sun, Guo-Gang Shan, Wen-Fa Xie, and Zhong-Min Su. "Low efficiency roll-off and high performance OLEDs employing alkyl group modified iridium(iii) complexes as emitters." RSC Advances 6, no. 112 (2016): 111556–63. http://dx.doi.org/10.1039/c6ra24142e.

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Four Ir(iii) dyes employing modified 1,2-diphenyl-1H-benzoimidazole ligands were synthesized. Doped device using tBu-Ir-PI with tert-butyl group as emitter achieves high η<sub>c</sub> of 42.0 cd A<sup>−1</sup> and η<sub>p</sub> of 27.0 lm W<sup>−1</sup>, respectively.

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7

Karthikeyan, Iyyanar, Dhanarajan Arunprasath, and Govindasamy Sekar. "An efficient synthesis of pyrido[1,2-a]indoles through aza-Nazarov type cyclization." Chemical Communications 51, no. 9 (2015): 1701–4. http://dx.doi.org/10.1039/c4cc08783f.

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Transition metal free Brønsted acid mediated synthesis of pyrido[1,2-a]indole scaffolds has been developed through aza-Nazarov type cyclization of readily available diaryl(2-pyridyl)methanol using formic acid for the synthesis of biologically and medicinally important pyrido[1,2-a]indole, indolo[1,2-a]quinoline and pyrimido[1,2-a]indole derivatives.

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8

Ramle, Abdul Qaiyum, Chee Chin Fei, Edward R. T. Tiekink, and Wan Jefrey Basirun. "Indoleninyl-substituted pyrimido[1,2-b]indazoles via a facile condensation reaction." RSC Advances 11, no. 40 (2021): 24647–51. http://dx.doi.org/10.1039/d1ra04372b.

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9

Abdel-fattah, A. M., S. M. Sherif, A. M. El-reedy, and S. A. Gad-alla. "NEW SYNTHESIS OF IMIDAZO[1,2-a]- AND PYRIMIDO[1,2-a]PYRIMIDINES." Phosphorus, Sulfur, and Silicon and the Related Elements 70, no. 1 (1992): 67–73. http://dx.doi.org/10.1080/10426509208049153.

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10

Toplak, Renata, Jurij Svete, Simona Golič Grdadolnik, and Branko Stanovnik. "Methyl (Z)-2-[(Benzyloxycarbonyl)amino]-3-dimethyl- aminopropenoate in the Synthesis of Heterocyclic Systems. Synthesis of (Benzyloxycarbonyl)amino Substituted Fused Pyrimidinones." Collection of Czechoslovak Chemical Communications 64, no. 2 (1999): 177–89. http://dx.doi.org/10.1135/cccc19990177.

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Methyl (Z)-2-[(benzyloxycarbonyl)amino]-3-dimethylaminopropenoate (1) was used as a reagent for preparation of 3-[(benzyloxycarbonyl)amino] substituted 4H-pyrido[1,2-a]pyrimidin-4-ones 17-21, 4H-pyrimido[1,2-b]pyridazin-4-ones 22 and 23, 5H-[1,2,4]triazolo[2,3-a]- pyrimidin-5-one 24, 5H-thiazolo[3,2-a]pyrimidin-5-one 25, and 4H-pyrazino[1,2-a]pyrimidin-4-one 26. Removal of the benzyloxycarbonyl group by catalytical transfer hydrogenation with Pd/C in the presence of cyclohexene is selective to give 3-amino-4H-pyrido[1,2-a]- pyrimidin-4-ones 27-30 in 85-92% yields, or with hydrogen bromide in a

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11

Khodjaniyazov, Khamid U., Utkir S. Makhmudov, Kambarali K. Turgunov, and Burkhon Z. Elmuradov. "Unusual formation of (E)-11-(aminomethylene)-8,9,10,11-tetrahydropyrido[2′,3′:4,5]pyrimido[1,2-a]azepin-5(7H)-one and its crystal structure." Acta Crystallographica Section E Crystallographic Communications 73, no. 10 (2017): 1497–500. http://dx.doi.org/10.1107/s2056989017013093.

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Selective C-formylation of 8,9,10,11-tetrahydropyrido[2′,3′:4,5]pyrimido[1,2-a]-azepin-5(7H)-one has been studied for the first time. It was revealed that formylation proceeds by the formation of an intermediate salt, which due to the re-amination process on treatment with aqueous ammonia transformed into the corresponding (E)-11-(aminomethylene)-8,9,10,11-tetrahydropyrido[2′,3′:4,5]-pyrimido[1,2-a]azepin-5(7H)-one, C13H14N4O, as anE-isomer. Formylation was carried out by Vilsmeier–Haack reagent and the structure of the synthesized compound was confirmed by X-ray structural analysis, spectrosc

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12

Friary, Richard, Andrew T. McPhail, and Vera Seidl. "Novel Syntheses of Tricyclic, N-Aryl, Pyridine- and Pyrazine-Fused Pyrimidones." Collection of Czechoslovak Chemical Communications 58, no. 5 (1993): 1133–50. http://dx.doi.org/10.1135/cccc19931133.

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2-methylthio-2-imidazoline and 2-methylthio-1,4,5,6-tetrahydro-2-pyrimidine amidated 2-chloro-3-pyridine- and 2-chloro-3-pyrazinecarbonyl chlorides. The products reacted with aromatic amines forming a series of tricyclic, linearly fused N-aryl pyrimidones. Included among these pyrimidones were 10-aryl-2,3-dihydroimidazo[1,2-a]pyrido[2,3-d]pyrimidin-5(10H)-ones, 11-aryl-2,3,4,11-tetrahydropyrido-[2,3-d]pyrimido[1,2-a]pyrimidin-6(6H)-ones, 10-aryl-2,3-dihydroimidazo[1,2-a]pyrazino[2,3-d]pyrimidin-5(10H)-ones and 11-aryl-2,3,4,11-tetrahydropyrimido-[1,2-a]pyrazino[2,3-d]pyrimidin-6(6H)-ones. 4,5,

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13

Xia, Guomin, Chengyan Ruan, and Hongming Wang. "Highly sensitive detection of carbon dioxide by a pyrimido[1,2-a]benzimidazole derivative: combining experimental and theoretical studies." Analyst 140, no. 15 (2015): 5099–104. http://dx.doi.org/10.1039/c5an00947b.

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14

Sachdeva, Nikhil, Anton V. Dolzhenko, Seow Joo Lim, Wee Ling Ong, and Wai Keung Chui. "An efficient synthesis of 2,4,7-trisubstituted pyrimido[1,2-a][1,3,5]triazin-6-ones." New Journal of Chemistry 39, no. 6 (2015): 4796–804. http://dx.doi.org/10.1039/c5nj00405e.

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15

Frolov, A. N. "Photochemical synthesis of pyrimido[1,2-a]benzimidazole derivatives." Russian Journal of General Chemistry 74, no. 12 (2004): 1949–51. http://dx.doi.org/10.1007/s11176-005-0125-1.

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16

Tseng, Shin-Shyong, Joseph W. Epstein, Herbert J. Brabander, and Gerardo Francisco. "A simple regioselective synthesis of pyrimido[1,2-a]benzimidazoles." Journal of Heterocyclic Chemistry 24, no. 3 (1987): 837–43. http://dx.doi.org/10.1002/jhet.5570240357.

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17

ABDEL-FATTAH, A. M., S. M. SHERIF, A. M. EL-REEDY, and S. A. GAD-ALLA. "ChemInform Abstract: New Synthesis of Imidazo(1,2-a)- and Pyrimido(1,2-a)pyrimidines." ChemInform 24, no. 6 (2010): no. http://dx.doi.org/10.1002/chin.199306201.

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18

Liu, Guangmin, Qingqing Shao, Shujiang Tu, et al. "Green multicomponent synthesis of 1,2-dihydro-pyrimido[1,2-a]-benzimidazole-3-carbonitrile." Journal of Heterocyclic Chemistry 45, no. 4 (2008): 1127–30. http://dx.doi.org/10.1002/jhet.5570450429.

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19

Abu-Hashem, Ameen. "Synthesis of New Furothiazolo Pyrimido Quinazolinones from Visnagenone or Khellinone and Antimicrobial Activity." Molecules 23, no. 11 (2018): 2793. http://dx.doi.org/10.3390/molecules23112793.

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Substituted-6-methyl-1-thioxo-1,2-dihydro-3H-furo[3,2-g]pyrimido[1,6-a]quinazolin-3-ones (5a,b) were synthesized from condensation of visnagenone (2a) or khellinone (2b) with 6-amino-thiouracil (3) in dimethylformamide or refluxing of (4a) or (4b) in dimethylformamide. Hence, compounds (5a,b) were used as the starting materials for preparing many new heterocyclic compounds such as; furo[3,2-g]pyrimido[1,6-a]quinazoline (6a,b), furo[3,2-g]thiazolo[2′,3′:2,3]pyrimido[1,6-a]quinazolinone (7a,b), substituted-benzylidene-furo[3,2-g]thiazolo[2′,3′:2,3]pyrimido[1,6-a]quinazoline-3,5-dione (8a–f), 3-o

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20

El Haimer, Mohamed, Márta Palkó, Matti Haukka, Márió Gajdács, István Zupkó, and Ferenc Fülöp. "Synthesis and biological evaluation of the new ring system benzo[f]pyrimido[1,2-d][1,2,3]triazolo[1,5-a][1,4]diazepine and its cycloalkane and cycloalkene condensed analogues." RSC Advances 11, no. 12 (2021): 6952–57. http://dx.doi.org/10.1039/d0ra10553h.

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Derivatives of the new ring system benzo[f]pyrimido[1,2-d][1,2,3]triazolo[1,5-a][1,4]diazepinone and its cycloalkane and cycloalkene condensed analogues have been conveniently synthesized through a three-step reaction sequence.

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21

Kasatkina, Svetlana O., Ekaterina E. Stepanova, Maksim V. Dmitriev, Ivan G. Mokrushin, and Andrey N. Maslivets. "Synthesis of pyrimido[1,6-a]quinoxalines via intermolecular trapping of thermally generated acyl(quinoxalin-2-yl)ketenes by Schiff bases." Beilstein Journal of Organic Chemistry 14 (July 11, 2018): 1734–42. http://dx.doi.org/10.3762/bjoc.14.147.

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Acyl(quinoxalin-2-yl)ketenes generated by thermal decarbonylation of 3-acylpyrrolo[1,2-a]quinoxaline-1,2,4(5H)-triones react regioselectively with Schiff bases under solvent-free conditions to form pyrimido[1,6-a]quinoxaline derivatives in good yields.

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22

V. Dolzhenko, Anton. "Synthetic Routes towards Pyrimido[1,2-a][1,3,5]triazines (Review)." HETEROCYCLES 83, no. 7 (2011): 1489. http://dx.doi.org/10.3987/rev-11-701.

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23

DESENKO, S. M., V. D. ORLOV, V. V. LIPSON, O. V. SHISHKIN, S. V. LINDEMAN, and YU T. STRUCHKOV. "ChemInform Abstract: 3-Hydroxy-Substituted Pyrimido(1,2-a)benzimidazoles." ChemInform 25, no. 8 (2010): no. http://dx.doi.org/10.1002/chin.199408110.

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24

Goryaeva, M. V., Ya V. Burgart, V. I. Saloutin, and O. N. Chupakhin. "Regiodirected synthesis of polyfluoro-alkylated pyrimido[1,2-a]benzimidazoles." Chemistry of Heterocyclic Compounds 48, no. 2 (2012): 372–76. http://dx.doi.org/10.1007/s10593-012-1000-8.

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25

Dorokhov, V. A., M. F. Gordeev, and Z. K. Dem'yanets. "New synthesis of functionally substituted pyrimido[1,2-a]benzimidazoles." Chemistry of Heterocyclic Compounds 23, no. 10 (1987): 1147–48. http://dx.doi.org/10.1007/bf00476555.

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26

Zanatta, Nilo, Aurea Echevarria, Simone Amaral, et al. "Synthesis and Characterization of Some Novel 2-(Trifluoromethyl)pyrimido[1,2-a]benzimidazoles and Pyrimido[1,2-a]benzimidazol-2H)-ones of Biological Interest." Synthesis 2006, no. 14 (2006): 2305–12. http://dx.doi.org/10.1055/s-2006-942444.

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27

Orlov, V. D., S. M. Desenko, V. P. Kruglenko, V. P. Gnidets, N. A. Klyuev, and M. V. Povstyanoi. "Formation of pyrimido[1,2-a]benzimidazoles in reaction of 1,2-diaminobenzimidazole with chalcones." Chemistry of Heterocyclic Compounds 22, no. 8 (1986): 927. http://dx.doi.org/10.1007/bf01175075.

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28

Sirakanyan, Spinelli, Geronikaki, et al. "Synthesis, Antitumor Activity, and Docking Analysis of New Pyrido[3’,2’:4,5]furo(thieno)[3,2-d]pyrimidin-8-amines." Molecules 24, no. 21 (2019): 3952. http://dx.doi.org/10.3390/molecules24213952.

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Continuing our research in the field of new heterocyclic compounds, herein we report on the synthesis and antitumor activity of new amino derivatives of pyrido[3’,2’:4,5](furo)thieno[3,2-d]pyrimidines as well as of two new heterocyclic systems: furo[2–e]imidazo[1,2-c]pyrimidine and furo[2,3-e]pyrimido[1,2-c]pyrimidine. Thus, by refluxing the 8-chloro derivatives of pyrido[3’,2’:4,5]thieno(furo)[3,2-d]pyrimidines with various amines, the relevant pyrido[3’,2’:4,5]thieno(furo)[3,2-d]pyrimidin-8-amines were obtained. Further, the cyclization of some amines under the action of phosphorus oxychlori

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29

Nowicka, Anna, Hanna Liszkiewicz, Wanda Nawrocka, Joanna Wietrzyk, Katarzyna Kempińska, and Andrzej Dryś. "Synthesis and antiproliferative activity in vitro of new 2-aminobenzimidazole derivatives. Reaction of 2-arylideneaminobenzimidazole with selected nitriles containing active methylene group." Open Chemistry 12, no. 10 (2014): 1047–55. http://dx.doi.org/10.2478/s11532-014-0533-3.

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AbstractA series of pyrimido[1,2-a]benzimidazole and α-cyanocinnamic acid derivatives have been synthesized in the reactions of Schiff bases 2–7 with selected nitriles containing an active methylene group: malononitrile 8–12, cyanoacetamide 13–16, benzyl cyanide 17–21, benzoylacetonitrile 22–24, cyanoacetate methyl ester 25–28 and benzylacetamide 29. The structures 8–29 were confirmed by the results of elementary analysis and their IR, 1H-, 13C-NMR and MS spectra. The products 8–29 of various chemical structure pyrimido[1,2-a] benzimidazole 8–12, 14–16, 17–21, 23–24, 26 and α-cyanocinnamic aci

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30

Dorokhov, V. A., M. F. Gordeev, Z. K. Dem'yanets, et al. "Synthesis of derivatives of the new heterocyclic system pyrimido[4?,5?:4,5]pyrimido[1,2-a]benzimidazole." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 40, no. 11 (1991): 2262–66. http://dx.doi.org/10.1007/bf00961049.

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31

Dodonova, Jelena, and Sigitas Tumkevicius. "Fused Pyrrolo[2,3-d]pyrimidines (7-Deazapurines) by Palladium-Catalyzed Direct N–H and C–H Arylation Reactions." Synthesis 49, no. 11 (2017): 2523–34. http://dx.doi.org/10.1055/s-0036-1588734.

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Palladium-catalyzed intramolecular direct C–H arylations for the synthesis of hitherto unknown fused hetero systems containing an incorporated pyrrolo[2,3-d]pyrimidine scaffold are described. Pyrimido[5′,4′:4,5]pyrrolo[2,1-a]isoindoles were synthesized from 2,4-diarylpyrrolo[2,3-d]pyrimidines and o-bromobenzyl bromides by using a cascade N-benzylation/C–H arylation reaction sequence. A series of pyrimido[5′,4′:4,5]pyrrolo[1,2-f]phenanthridines were successfully assembled via a domino process involving the palladium-catalyzed direct double C–H arylation reactions of 2,4,7-triarylpyrrolo[2,3-d]

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32

Guo, Xiaolong, Luyao Wang, Jing Hu, and Mengmeng Zhang. "CuI nanoparticle-catalyzed synthesis of tetracyclic benzo[e]benzo[4,5]imidazo[1,2-c][1,3]thiazin-6-imine heterocycles by SNAr-type C–S, C–N bond formation from isothiocyanatobenzenes and benzimidazoles." RSC Advances 8, no. 39 (2018): 22259–67. http://dx.doi.org/10.1039/c8ra02552e.

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We proposed a practical synthesis of analogs of the anti-HIV drug 3,4-dihydro-2H,6H-pyrimido[1,2-c][1,3]benzothiazin-6-imine via a CuI nanoparticle-catalyzed intramolecular C(sp<sup>2</sup>)–S coupling reaction.

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33

Avendaño, Carmen, Claudia Romano, and Elena de la Guesta. "Reactions of 1,2-Diaminobenzimidazoles with b-Dielectrophiles: Synthesis of Pyrimido[1,2-a]benzimidazole Derivatives." HETEROCYCLES 31, no. 2 (1990): 267. http://dx.doi.org/10.3987/com-89-5197.

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34

Dolzhenko, Anton V. "ChemInform Abstract: Synthetic Routes Towards Pyrimido[1,2-a][1,3,5]triazines." ChemInform 42, no. 44 (2011): no. http://dx.doi.org/10.1002/chin.201144225.

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35

Friary, R., J. H. Schwerdt, V. Seidl, and F. J. Villani. "A Synthesis of imidazo- and pyrimido[1,2-g][1,6]naphthyridinones." Journal of Heterocyclic Chemistry 27, no. 2 (1990): 189–93. http://dx.doi.org/10.1002/jhet.5570270214.

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36

Goryaeva, M. V., Ya V. Burgart, V. I. Saloutin, and O. N. Chupakhin. "ChemInform Abstract: Regiodirected Synthesis of Polyfluoroalkylated Pyrimido[1,2-a]benzimidazoles." ChemInform 43, no. 44 (2012): no. http://dx.doi.org/10.1002/chin.201244164.

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37

Cliffe, Ian A., Eric L. Lien, Howard L. Mansell, et al. "Oral hypoglycemic agents. Pyrimido[1,2-a]indoles and related compounds." Journal of Medicinal Chemistry 35, no. 7 (1992): 1169–75. http://dx.doi.org/10.1021/jm00085a001.

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38

Vandyshev, Dmitriy Yu, Khidmet S. Shikhaliev, Anna V. Kokonova, et al. "A novel method for the synthesis of pyrimido[1,2-a]benzimidazoles." Chemistry of Heterocyclic Compounds 52, no. 7 (2016): 493–97. http://dx.doi.org/10.1007/s10593-016-1914-7.

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39

Столповская, N. Stolpovskaya, Перегудова, A. Peregudova, Шихалиев, and Kh Shikhaliev. "DEVELOPMENT OF METHODS FOR THE SYNTHESIS OF NEW HET-EROCYCLIC COMPOUNDS, PROMISING TO CREATE A DRUG FOR THE TREATMENT OF SOCIALLY SIGNIFICANT DISEASES." Voronezh Scientific-Technical Bulletin 4, no. 4 (2015): 8–9. http://dx.doi.org/10.12737/17001.

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Studied cyclization N-aryl biguanides (ketones and keto esters) installed chemoselectivity of this process. An approach to syn tezu new heterocyclic sys-tem 2-amino-1,4-dihydro-pyrimido [1,2-a] [1,3,5] triazin-6-ones. Investigated methods of synthesis AZAG-terotsiklicheskih systems: 1,3,5-triazine, pyrimidine, dihydropyrimidine-6-ones based on N-arilbiguanidov.

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40

Trapani, G., M. Franco, A. Latrofa, et al. "Synthesis and benzodiazepine receptor binding of some imidazo-, pyrimido[2,1-b]benzoxazoles and pyrimido[1,2-a]benzimidazoles." European Journal of Medicinal Chemistry 32, no. 1 (1997): 83–89. http://dx.doi.org/10.1016/s0223-5234(97)84364-4.

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41

Baharfar, Robabeh, and Narges Shariati. "Solvent-free Synthesis of Novel Benzothiazole-substituted 4-Thiazolidinones Using Nano Silica-bonded 5-n-Propyl-octahydro-pyrimido[1,2-a]azepinium Chloride as Catalyst." Australian Journal of Chemistry 67, no. 11 (2014): 1646. http://dx.doi.org/10.1071/ch13712.

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A series of novel benzothiazole-substituted 4-thiazolidinones were synthesised by the one-pot reaction of rhodanine-3-acetic acid derivatives, 2-aminothiophenol, and triphenyl phosphite in the presence of nano silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (NSB-DBU) as heterogeneous reusable nanocatalyst under solvent-free conditions in high yields.

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42

Tu, Shujiang, Chunmei Li, Guigen Li, et al. "Microwave-Assisted Combinatorial Synthesis of Polysubstituent Imidazo[1,2-a]quinoline, Pyrimido[1,2-a]quinoline and Quinolino[1,2-a]quinazoline Derivatives." Journal of Combinatorial Chemistry 9, no. 6 (2007): 1144–48. http://dx.doi.org/10.1021/cc700124g.

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43

Shah, Nirav M., and Hitendra S. Joshi. "Synthesis and Antimicrobial Screening of some New Pyrimido[1,2-a]Benzimidazole Derivatives." International Letters of Chemistry, Physics and Astronomy 25 (January 2014): 56–60. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.25.56.

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Some new pyrimido[1,2-a]benzimidazole derivatives were synthesized by reacting 2-amino benzimidazole and chalcones in n-butanol at reflux temperature. In our present study we have used various heterocyclic chalcones derived from furfural and substituted acetophenones. All synthesized compounds were characterized by IR, 1H NMR and Mass spectroscopy. All synthesized compounds were screened for their antimicrobial activity against gram positive and gram negative bacteria which showed moderate to good activity.

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44

Makhsous, Masoumeh, Farhad Shirini, Mohadeseh Seddighi, and Masoumeh Mazloumi. "Efficient Synthesis of Pyrimido[1,2-a]Benzimidazoles and Ethyl Pyrimido[1,2-a]Benzimidazole-3-Carboxylates Using Brönsted Acidic Ionic Liquid Supported on Nanoporous Na+-Montmorillonite." Polycyclic Aromatic Compounds 40, no. 2 (2018): 494–501. http://dx.doi.org/10.1080/10406638.2018.1454967.

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Font, David, Anthony Linden, Montserrat Heras, and José M. Villalgordo. "A simple approach for the regioselective synthesis of imidazo[1,2-a]pyrimidiones and pyrimido[1,2-a]pyrimidinones." Tetrahedron 62, no. 7 (2006): 1433–43. http://dx.doi.org/10.1016/j.tet.2005.11.014.

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Belyaev, Danila V., Dmitrii L. Chizhov, Mikhail I. Kodess, Marina A. Ezhikova, Gennady L. Rusinov, and Valery N. Charushin. "Synthesis of 2-(polyfluoromethyl)pyrimido-[1,2-a]benzimidazole-4-carbaldehyde derivatives." Mendeleev Communications 29, no. 3 (2019): 249–51. http://dx.doi.org/10.1016/j.mencom.2019.05.002.

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Grosjean, Sylvain, Smail Triki, Jean-Claude Meslin, Karine Julienne, and David Deniaud. "Synthesis of nitrogen bicyclic scaffolds: pyrimido[1,2-a]pyrimidine-2,6-diones." Tetrahedron 66, no. 52 (2010): 9912–24. http://dx.doi.org/10.1016/j.tet.2010.10.059.

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DYAGUTITE, R., and A. SHACHKUS. "ChemInform Abstract: 1,2,3,6,7,11b-Hexahydro-4H-pyrimido(1,2-a)isoquinolin-2-ones." ChemInform 25, no. 7 (2010): no. http://dx.doi.org/10.1002/chin.199407190.

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Ahmed, Samia G., Abd-El Hamid N. Ahmed, Nabil M. Omar, and Mahmoud A. El-Gendy. "Synthesis and structural assignment of certain pyrimido[1,2-a]benzimidazole derivatives." Journal of Chemical Technology & Biotechnology 57, no. 4 (2007): 363–70. http://dx.doi.org/10.1002/jctb.280570411.

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Hassanabadi, Alireza, Mohammad H. Mosslemin, Mohammad Anary-Abbasinejad, and Somayeh Koocheki. "One-pot synthesis of highly functionalized 2H-pyrimido[1,2-a]benzimidazoles." Monatshefte für Chemie - Chemical Monthly 144, no. 2 (2012): 227–30. http://dx.doi.org/10.1007/s00706-012-0796-3.

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