Multicomponent Tether Catalysis Synthesis of Highly Functionalized 4-(Pyridin-2-ylmethyl)-2-aminopyrroles via Cascade Reaction Is Accompanied by Decarboxylation
作者:Kun Li、Li Chen、Yun-Xiang Fan、Yao Wei、Sheng-Jiao Yan
DOI:10.1021/acs.joc.9b01814
日期:2019.9.20
catalysis protocol for the synthesis of 4-(pyridin-2-ylmethyl)-2-aminopyrroles (PMAPs) was constructed by simply refluxing a mixture of ethyl 2-(pyridin-2-yl)acetates 1 and various types of arylglyoxal monohydrates 2 and different heterocyclic ketene aminals 3 in EtOH solvent. Based on this reaction, a series of highly functionalized PMAPs were obtained through a novel cascadereaction accompanied by a decarboxylation
Multicomponent Cascade Reaction by Metal-Free Aerobic Oxidation for Synthesis of Highly Functionalized 2-Amino-4-coumarinyl-5-arylpyrroles
作者:Quan-Xing Zi、Chang-Long Yang、Kun Li、Qin Luo、Jun Lin、Sheng-Jiao Yan
DOI:10.1021/acs.joc.9b02063
日期:2020.1.17
A novel approach has been constructed for the synthesis of two types of 2-amino-4-coumarinyl-5-arylpyrroles (ACAPs, 5 and 6) through a cascade reaction and a metal-free catalyzed aerobic oxidation reaction of arylglyoxal monohydrates 1, 1,1-enediamines (EDAMs) 2 and 3, and 4-hydroxy-2H-chromen-2-ones 4 via multicomponentreactions to produce the target compounds with good to excellent yields. Specifically
A series of novel 3-/2,3-substituted pyrido[4,3-e][1,2,4]triazino[3,2-c][1,2,4]thiadiazine 6,6-dioxides 4-28 have been synthesized by the reaction of 3-amino-2-(4-thioxo-1,4-dihydropyridin-3-yl-sulfonyl)guanidine with either 2-oxoalkanoic acids and its esters, or phenylglyoxylic hydrates in glacial acetic acid. Some of them exhibited reasonable or moderate anticancer activity toward human cancer cell
A highlyefficient quinine-derived primary-amine-catalyzed asymmetricaldol addition of hydroxyacetone to arylglyoxals is described. Structurally diverse anti-2,3-dihydroxy-1,4-diones were generated in high yields, with good diastereoselectivities and enantioselectivities.