A palladium-catalyzed enantioselective hydroesterification of alkenylphenols with phenyl formate. A facile approach to optically active dihydrocoumarins
作者:Jingfu Li、Wenju Chang、Wenlong Ren、Wei Liu、Haining Wang、Yian Shi
DOI:10.1039/c5ob01431j
日期:——
An effective palladium-catalyzed enantioselective hydroesterification of alkenylphenols with phenyl formate as a CO source is described.
Catalytic Asymmetric Cyclocarbonylation of <i>o</i>-Isopropenylphenols: Enantioselective Synthesis of Six-Membered Ring Lactones
作者:Chune Dong、Howard Alper
DOI:10.1021/jo040109f
日期:2004.7.1
Cyclocarbonylation of o-isopropenylphenols with CO (500 psi) and H2 (100 psi), using Pd(OAc)2 and (+)-DIOP as the chiral catalyst, in CH2Cl2 affords 3,4-dihydro-4-methylcoumarins in 60−85% yield and in up to 90% enantiomeric excess. The stereoselectivity is influenced by the structure of the chiral phosphine ligands and substrates, as well as by the reaction conditions.