(3S-trans)-3-[[(1,1-Dimethylethoxy)carbonyl]amino]-4-methyl-β,2-dioxo-1-azetidinepropionic acid, methyl ester 在
乙醚 作用下,
以
trifluoracetic acid-dichloromethane 为溶剂,
反应 0.25h,
以0.31 g of the title compound was obtained as a crystalline material, melting point 75° C. dec.的产率得到(3S-trans)-3-amino-4-methyl-β,2-dioxo-1-azetidinepropionic acid, methyl ester