A catalytic enantioselective addition reaction of silyl enol ethers to ketomalonate in the presence of C2-symmetric copper(II) bisoxazolines as catalysts is presented; the reaction has been studied for different ligands and substrates under various reaction conditions and proceeds in good yield and with ee’s >90% and a procedure for the preparation of an optically active hydroxy acid is shown.
Asymmetric Allylic C–H Alkylation via Palladium(II)/<i>cis</i>-ArSOX Catalysis
作者:Wei Liu、Siraj Z. Ali、Stephen E. Ammann、M. Christina White
DOI:10.1021/jacs.8b05668
日期:2018.8.29
asymmetric C-H alkylation of terminal olefins with a variety of synthetically versatile nucleophiles. The modular, tunable, and oxidatively stable ArSOX scaffold is key to the unprecedented broad scope and high enantioselectivity (37 examples, avg. > 90% ee). Pd(II)/ cis-ArSOX is unique in its ability to effect high reactivity and catalyst-controlled diastereoselectivity on the alkylation of aliphatic