Enantioselective Pd-Catalyzed Allylic Alkylation of Indoles by a New Class of Chiral Ferrocenyl P/S Ligands
作者:Hong Yee Cheung、Wing-Yiu Yu、Fuk Loi Lam、Terry T.-L. Au-Yeung、Zhongyuan Zhou、Tak Hang Chan、Albert S. C. Chan
DOI:10.1021/ol7018532
日期:2007.10.1
Chiral ferrocenyl heterobidentateP/Sligands bearing both central and planar chirality were prepared from (S)-Ugi's amine via a three-step modular synthesis. Through systematic screening and optimization, L8 was found to be the best ligand for Pd-catalyzed asymmetric allylic alkylation of indoles with ee's up to 96% being attained.