An efficient synthesis of enantiomerically enriched aryllactic esters
作者:Bruce A. Lefker、William A. Hada、Patrick J. McGarry
DOI:10.1016/s0040-4039(00)77064-x
日期:1994.7
An efficient synthesis of enantiomericallyenriched aryllactic esters or acids has been established. Darzen's condensation of arylaldehydes with ethyl chloroacetate followed by catalytic hydrogenation gave racemic aryllactic esters. Enzyme catalyzed (lipase PS-30, Amano) hydrolysis or acetylation provided enantiomericallyenriched products. EE's of 65–99% were obtained without optimization of resolution
Phenyllactic acids are found in numerous natural products as well as in active substances used in medicine or plant protection. Enantiomerically pure phenyllactic acids are available by transition-metal-catalyzed hydrogenations or chemoenzymatic reductions of the corresponding 3-aryl-2-oxopropanoic acids. We show here that d-lactate dehydrogenase from Staphylococcus epidermidis reduces a broad spectrum of 2-oxo acids, which are difficult substrates for transition-metal-catalyzed reactions, with excellent enantioselectivities in a simple experimental setup.