tert-butyl N-[(8S,11R,14R)-11-[(R)-[tert-butyl(dimethyl)silyl]oxy-(4-fluoro-3-nitrophenyl)methyl]-8-(hydroxymethyl)-5,18-dimethoxy-4-methyl-10,13-dioxo-2-oxa-9,12-diazatricyclo[13.3.1.13,7]icosa-1(18),3,5,7(20),15(19),16-hexaen-14-yl]carbamate 在
chromium(VI) oxide 、
硫酸 作用下,
以
丙酮 为溶剂,
以79%的产率得到(8S,11R,14R)-14-tert-Butoxycarbonylamino-11-[(R)-(tert-butyl-dimethyl-silanyloxy)-(4-fluoro-3-nitro-phenyl)-methyl]-5,18-dimethoxy-4-methyl-10,13-dioxo-2-oxa-9,12-diaza-tricyclo[13.3.1.1
3,7]icosa-1(18),3(20),4,6,15(19),16-hexaene-8-carboxylic acid