Palladium-Catalyzed Enantioselective Decarboxylative Allylic Alkylation of Cyclopentanones
作者:Robert A. Craig、Steven A. Loskot、Justin T. Mohr、Douglas C. Behenna、Andrew M. Harned、Brian M. Stoltz
DOI:10.1021/acs.orglett.5b02376
日期:2015.11.6
The first general method for the enantioselective construction of all-carbon quaternary centers on cyclopentanones by enantioselective palladium-catalyzed decarboxylative allylic alkylation is described. Employing the electronically modified (S)-(p-CF3)(3)-t-BuPHOX ligand, alpha-quaternary cyclopentanones were isolated in yields up to >99% with ee's up to 94%. Additionally, in order to facilitate large-scale application of this method, a low catalyst loading protocol was employed, using as little as 0.15 mol % Pd, furnishing the product without any loss in ee.