反应详情

A method similar to that used for the preparation of (107b) was used except that methyl N-[(3,5-difluorophenyl)acetyl]-L-methioninate (109a) (300 mg) was used instead of methyl N-[(3,5-difluorophenyl)acetyl]-L-valinate to afford the desired product (237 mg). This material was not further characterized but used in the next step.