摘要:
L-methionine is obtained in good yield and high e.e. by using the carboxylation of an enantiopure alpha-lithio oxazolidinone prepared by tin-lithium exchange. The entire process from alpha-stannyl oxazolidinone takes 35-40mn, time which is compatible with the use of (CO2)-C-11 in radioactive chemistry directed to PET imaging. (C) 1997 Published by Elsevier Science Ltd.