(R)-tert-butoxycarbonylamino-[4-(2-hydroxy-ethoxy)-phenyl]-acetic acid methyl ester 、
甲基磺酰氯 在
crude product 、 silica gel 、 hexanes ethyl acetate 作用下,
以
吡啶 为溶剂,
反应 3.0h,
以to give (R)-tert-butoxycarbonylamino-[4-(2-methanesulfonyloxy-ethoxy)-phenyl]-acetic acid methyl ester (50 mg, 50% yield) as a colorless oil的产率得到(R)-tert-butoxycarbonylamino-[4-(2-methanesulfonyloxy-ethoxy)-phenyl]-acetic acid methyl ester