Box-copper catalyzed cascade asymmetric amidation for chiral <i>exo</i>-methylene aminoindoline derivatives
作者:Xiao-Peng Yang、Hao-Peng Lv、Hao-Di Yang、Bai-Lin Wang、Xing-Wang Wang
DOI:10.1039/d1ob01242h
日期:——
transformation was triggered by the attack of hydroxamates to dipolar copper–allenylidene intermediates, followed by a nucleophilic annulation reaction. Thus, a series of exo-methylene 3-aminoindoline derivatives were obtained in good yields with high enantioselectivities under mild reaction conditions.
Leveraging the Domino Skeletal Expansion of Thia-/Selenazolidinones via Nitrogen-Atom Transfer in Hexafluoroisopropanol: Room Temperature Access to Six-Membered S/Se,N-Heterocycles
作者:Vandana Jaiswal、Mangilal Godara、Dinabandhu Das、Vincent Gandon、Jaideep Saha
DOI:10.1021/acs.joc.1c02621
日期:2022.1.7
Herein, a highly regioselective domino skeletal-expansion process that transforms 2-aminothiazolidinone into six-membered S,N-heterocycle is developed with the aid of TMS-azide in hexafluoroisopropanol (HFIP) at ambient temperature. Functioning of the C2 tertiaryamine as latent reactive group on thiazolidinone moiety was the key to this development, which allowed relay substitution with azide and