[(2R,3S)-3-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-(2-ethoxy-ethylsulfanylthiocarbonylsulfanyl)-4-oxo-azetidin-1-yl]-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester 在
对苯二酚 作用下,
以
xylene 为溶剂,
反应 10.0h,
以77%的产率得到(5R,6S)-6-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-(2-ethoxy-ethylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester