A highlyenantioselective construction of an all-carbon quaternary stereogenic center at the α-position of malonic diesters has been achieved by Michaeladditionusing phase-transfer catalysis. The reaction of α-monosubstituted malonates with acrylates in the presence of N-(9-anthracenylmethyl)quininium chloride as a phase-transfer catalyst afforded the corresponding α,α-disubstituted malonic diesters
Alkene bifunctionalizations are powerful tools for the rapid construction of structurally complex and valuable scaffolds, and such reactions typically involve the use of transition‐metal catalysts or organocatalysts. Here, we report for the first time a photogenerated neutral nitrogen radical catalyzed intermolecularalkene bifunctionalization by using allyl sulfones as the source of both the carbon
A ruthenium‐catalyzed ortho‐alkenylation of acylgermanes with electron‐deficient alkenes through direct C–H bond activation has been developed. With acylgermane as the directing group, this method provides a straightforward access to diverse acylgermanes derivatives with good functional group tolerance and site‐selectivity under mild reaction conditions.
Rhodium‐catalyzed ortho‐C−Hfunctionalization is well known in the literature. Described herein is the Xphos‐supported rhodium catalysis of meta‐C−H olefination of benzylsulfonic acid and phenyl acetic acid frameworks with the assistance of a para‐methoxy‐substituted cyano phenol as the directing group. Complete mono‐selectivity is observed for both scaffolds. A wide range of olefins and functional groups
Development and Analysis of a Pd(0)-Catalyzed Enantioselective 1,1-Diarylation of Acrylates Enabled by Chiral Anion Phase Transfer
作者:Eiji Yamamoto、Margaret J. Hilton、Manuel Orlandi、Vaneet Saini、F. Dean Toste、Matthew S. Sigman
DOI:10.1021/jacs.6b11367
日期:2016.12.14
Enantioselective 1,1-diarylation of terminal alkenes enabled by the combination of Pd catalysis with a chiralanionphasetransfer (CAPT) strategy is reported herein. The reaction of substituted benzyl acrylates with aryldiazonium salts and arylboronic acids gave the corresponding 3,3-diarylpropanoates in moderate to good yields with high enantioselectivies (up to 98:2 er). Substituents on the benzyl