Silver-Catalyzed Vinylogous Fluorination of Vinyl Diazoacetates
摘要:
A silver-catalyzed vinylogous fluorination of vinyl diazoacetates to generate gamma-fluoro-alpha,beta-unsaturated carbonyls is presented. Application of this method to the fluorination of farnesol and steroid derivatives was achieved.
Catalytic Asymmetric Synthesis of Diarylacetates and 4,4-Diarylbutanoates. A Formal Asymmetric Synthesis of (+)-Sertraline
摘要:
The intermolecular C-H insertion chemistry of phenyldiazoacetates catalyzed by dirhodium tetrakis((S)-N (dodecylbenzenesulfonyl)prolinate) (Rh-2(S-DOSP)(4)) can be effectively carried out on cyclohexadienes, leading to the asymmetric synthesis of diarylacetates. The reaction of vinyldiazoacetates with cyclohexadienes results in an unprecedented carbenoid reaction that is formally a combined C-H insertion/Cope rearrangement. The synthetic utility of this novel transformation was demonstrated by its utilization in a formal asymmetric synthesis of (+)-sertraline.
Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer
作者:Guangyang Xu、Ping Chen、Pei Liu、Shengbiao Tang、Xinhao Zhang、Jiangtao Sun
DOI:10.1002/anie.201812937
日期:2019.2.11
A novel rhodium‐catalyzed dearomatization of O‐substituted pyridines to access N‐substituted 2‐pyridones has been developed. A computational study suggests a mechanism involving the formation of a pyridinium ylide followed by an unprecedented 1,4‐acyl migratory rearrangement from O to C. Furthermore, the chiral dirhodium complexes serve as the catalyst for the asymmetric transformation with excellent