A General Method for the Synthesis of Nonracemic <i>trans</i>-Epoxides: Concise Syntheses of <i>trans</i>-Epoxide-Containing Insect Sex Pheromones
作者:Baldip Kang、Robert Britton
DOI:10.1021/ol702273n
日期:2007.11.1
developed that provides rapid access to alkyl-, alkenyl-, alkynyl-, and phenyl-substituted trans-epoxides from aldehydes. This methodology has also been applied in concise and high-yielding syntheses of both trans-epoxide containing insect sex pheromones.
Enantioselective α-Chlorination of Aldehydes with Recyclable Fluorous (S)-Pyrrolidine-Thiourea Bifunctional Organocatalyst
作者:Chun Cai、Wei Zhang、Liang Wang、Dennis Curran
DOI:10.1055/s-0029-1219198
日期:2010.2
A novel fluorous (S)-pyrrolidine-thiourea bifunctional organocatalyst is prepared. The catalyst shows good activity and enantioselectivity for direct α-chlorination of aldehydes using N-chlorosuccinimide (NCS) as the chlorine source. It can be recovered from the reaction mixture by fluorous solid-phase extraction with excellent purity for direct reuse.