(Ξ)-[(RS)-2r-(2-[1,3]dioxolan-2-yl-phenyl)-4-oxo-3c-(2-phenoxy-acetylamino)-azetidin-1-yl]-hydroxy-acetic acid benzyl ester 在
吡啶 、
氯化亚砜 作用下,
生成 (Ξ)-chloro-[(
RS)-2
r-(2-[1,3]dioxolan-2-yl-phenyl)-4-oxo-3
c-(2-phenoxy-acetylamino)-azetidin-1-yl]-acetic acid benzyl ester