Unexpected reaction of a dimethylzinc-generated THF radical with aldehydes
摘要:
A dimethylzinc-air-generated THF radical reacted with aldehydes at the beta-position of an alpha-oxygenated THE (C) 2003 Elsevier Ltd. All rights reserved.
The enantioselective construction of all-carbon quaternary stereocenters on α-acyl-γ-butyrolactones has been achieved by the N-spiro chiral quaternary ammonium bromide 1-catalyzed alkylation under mild phase-transfer conditions. The resulting α-alkylated keto lactones serve as valuable chiral building blocks in organic synthesis as clearly demonstrated by the facile conversion to optically active α
A Palladium-Catalyzed Asymmetric Allylic Alkylation Approach to α-Quaternary γ-Butyrolactones
作者:Marllon Nascimento de Oliveira、Jeremy Fournier、Stellios Arseniyadis、Janine Cossy
DOI:10.1021/acs.orglett.6b02971
日期:2017.1.6
The Pd-catalyzed asymmetricallylic alkylation (Pd-AAA) of enol carbonates derived from γ-butyrolactones is reported, affording the corresponding enantioenriched α,α′-disubstituted γ-butyrolactones in both high yields and high enantioselectivities (up to 94% ee). This method was eventually applied to the synthesis of chiral spirocyclic compounds.
Organocatalytic enantioselective electrophilic amination of benzoyl butyrolactones
作者:Yan-Li Xu、Yu-Xia Wang、Gen-Fa Wen、Chao-Shan Da
DOI:10.1016/j.tetlet.2022.153745
日期:2022.4
Organocatalytic electrophilicamination of benzoyl butyrolactones with azodicarboxylates was demonstrated to highly efficiently prepare quaternary carbon stereocenter-bearing α-amino-γ-butyrolactones, key framework in numerous bioactive compounds. The squaramide C3 realized the highest yield (99%) and enantioselectivity (93%).