Copper-Catalyzed Three-Component Cascade Michael Addition/Heck-Type Alkylation/Annulation: Accessing Fully Substituted 1,3-Dihydro-2H-pyrrol-2-ones
摘要:
We report a highly efficient copper-catalyzed three-component reaction of alkylamines, acetylenedicarboxylates, and alpha-bromocarbonyls for the assembly of fully substituted 1,3-dihydro-2H-pyrrol-2-ones. A variety of alkylamines and ammonium salt are functionalized with acetylenedicarboxylates and alpha-bromocarbonyls. N-aryl enam-inoesters are also successfully alkylated with alpha-bromocarbonyls. This protocol is understood to proceed through radical Heck-type coupling of in-situ-generated bulky trisubstituted alkenes with bulky tertiary alkyl bromides, which is realized for the first time.
A novel and facile one-pot reaction has been developed to synthesize a variety of penta-substituted pyrroles from α-nitroepoxides, primary amines and dialkyl acetylenedicarboxylates under the conditions without catalyst. Furthermore, the controlled experiments has been performed and a possible mechanism has also been proposed.
Synthesis of fused pyrrolo[3,4-d]tetrahydropyrimidine derivatives by proline-catalyzed multicomponent reaction
作者:Zhi-Peng Chen、Hai-Bo Wang、Yu-Qin Wang、Qiu-Hua Zhu、Yang Xie、Shu-Wen Liu
DOI:10.1016/j.tet.2014.04.075
日期:2014.7
Novel proline-catalyzed multicomponent reactions (MCRs) for the synthesis of fused pyrrolo[3,4-d]tetrahydropyrimidines 7 and 9 with different substituted patterns have been developed, which provide rapid access to a library of compounds 7 and 9 in medium to excellent yields, by using N-methyl-α-aryl(alkyl)aminomaleimides, amines, and aldehydes as reactants. The catalyst and the ratio of reactants were
已开发出新型脯氨酸催化的多组分反应(MCR),用于合成具有不同取代模式的稠合吡咯并[3,4- d ]四氢嘧啶7和9,可在中等至极好的条件下快速访问化合物7和9的文库。通过使用N-甲基-α-芳基(烷基)氨基马来酰亚胺,胺和醛作为反应物,可得到苯甲酸酯。发现催化剂和反应物的比例对这些反应有显着影响,并提出了合理的机理。