Cyclization of 5-amino-1-aryl-1H-pyrazole-4-carbonitriles with β-dicarbonyl compounds
作者:Andrei Yu. Potapov、Dmitriy Yu. Vandyshev、Yevgeniya A. Kosheleva、Vladimir A. Polikarchuk、Mikhail A. Potapov、Khidmet S. Shikhaliev
DOI:10.1007/s10593-017-2041-9
日期:2017.2
for the preparation of new pyrazolo[3,4-b]pyridines and tetrahydropyrazolo[3,4-b]quinolinones by the reactions of 5-amino-1-aryl-1H-pyrazole-4-carbonitriles with aliphatic and cyclic 1,3-dicarbonyl compounds in the presence of anhydrous tin(IV) chloride.
已经开发了一种通过5-氨基-1-芳基-1 H-吡唑-4-腈与苯甲酸酯反应制备吡唑并[3,4- b ]吡啶和四氢吡唑并[3,4 - b ]喹啉酮的方法。在无水氯化锡(IV)存在下的脂族和环状1,3-二羰基化合物。
Cinchona Squaramide‐Catalyzed Intermolecular Desymmetrization of 1,3‐Diketones Leading to Chiral 1,4‐Dihydropyridines
作者:Maciej Dajek、Agnieszka Pruszczyńska、Krzysztof A. Konieczny、Rafał Kowalczyk
DOI:10.1002/adsc.202000455
日期:2020.9.8
Addition of prochiral cyclic 1,3‐diketones to Michael acceptors applying bifunctional Cinchona‐derived squaramides resulted in chiral adducts with stereoselectivities of up to 99% ee and allowed for desymmetrization of the nucleophile. These labile hemiacetal intermediates were transformed to new 1,4‐dihydropyridines with high diastereoselectivities and no erosion of optical purity. Their further oxidation
Free radical reactions for heterocycle synthesis: formation of keto spiro-γ-lactones and keto spiro-γ«ctams
作者:Wei Zhang、Georgia Pugh
DOI:10.1016/s0040-4039(99)01543-9
日期:1999.10
A new method for the synthesis of keto spiro-gamma-lactones and keto spiro-gamma-lactams by intramolecular free radical cyclization is described. (C) 1999 Elsevier Science Ltd. All rights reserved.
As a result of a hit-to-lead program using a technique of solution-phase parallel synthesis, a highly potent (2,4-dimethoxyphenyl)- [6- (3 -fluorophenyl)-4-hydroxy- 3 -methylbenzofuran -2 -yl] methanone (15b) was synthesized as an optimized derivative of 4-hydroxy-3-methyl-6-phenylbenzofuran-2-carboxylic acid ethyl ester (1), which was discovered as a screening hit from small-molecule libraries and exhibited selective cytotoxicity against a tumorigenic cell line. (C) 2004 Elsevier Ltd. All rights reserved.