A Palladium-Catalyzed Regioselective Hydroesterification of Alkenylphenols to Lactones with Phenyl Formate as CO Source
作者:Haining Wang、Ben Dong、Yang Wang、Jingfu Li、Yian Shi
DOI:10.1021/ol403171p
日期:2014.1.3
An effective Pd(OAc)2-PPh3 catalyzed hydroesterification of alkenylphenols with phenyl formate as CO surrogate is described. A variety of lactones are obtained in generally high yields with high regioselectivities. In one case, 76% ee is obtained with a chiral ligand.
3,4-Dihydrocoumarin derivatives were synthesized in a highly enantioselective manner from 3-(2-hydroxyphenyl)cyclobutanones through enantioselective carbon-carbon bond cleavage. A cascade reaction with electron-deficient alkenes introduced a carbon-carbon bond at the 5-position of the dihydrocoumarins.
Lactone Formation by Rhodium-Catalyzed C−C Bond Cleavage of Cyclobutanone