Potassium Acetate-Catalyzed Double Decarboxylative Transannulation To Access Highly Functionalized Pyrroles
作者:Jun-Kuan Li、Biying Zhou、Yu-Chen Tian、Chunman Jia、Xiao-Song Xue、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.orglett.0c03621
日期:2020.12.18
remodeling by utilizing CO2 moiety as tracelessactivating and directinggroups in both reaction partners. The synthetic value is evidenced by the rapid preparation of a broad spectrum of highly functionalized 3-carbamoyl-4-aryl pyrroles in good to excellent yields with exclusive regio-control, including the important Atorvastatin core.
Enantioselective synthesis of 1,2,4-triazolines catalyzed by a cinchona alkaloid-derived organocatalyst
作者:Qian Shao、Jiean Chen、Meihua Tu、David W. Piotrowski、Yong Huang
DOI:10.1039/c3cc46757k
日期:——
enantioselective organocatalytic process for the one-step synthesis of poly-substituted 1,2,4-triazolines is reported. The heterocycle formation is believed to go through a step-wise mechanism of nucleophilic addition of an azlactone to an azodicarboxylate in the presence of an organic base catalyst, followed by a TMSCHN2 mediated heterocyclization. Both theoretical calculations and experimental evidence suggest
molecular sieves as an additive. The reaction conditions were suitable to 4-alkyl and benzyl-substituted azlactones as well as N-(benzyl/alkyl/arylthio)succinimides, affording adducts with high enantioselectivities (81–94% ee).