(3R,6S,9S,12S,15S,18S,19S)-6-[(2S)-butan-2-yl]-15-[[tert-butyl(diphenyl)silyl]oxymethyl]-12-(3-methoxy-3-oxopropyl)-19-methyl-9-[(4-nitrophenyl)methoxymethyl]-5,8,11,14,17-pentaoxo-18-(phenylmethoxycarbonylamino)-1-thia-4,7,10,13,16-pentazacyclononadecane-3-carboxylic acid 在
吡啶 、 copper diacetate 、 lead(IV) tetraacetate 作用下,
以
四氢呋喃 为溶剂,
反应 3.5h,
以25%的产率得到methyl 3-[(2Z,6S,9S,12S,15S,18S,19S)-6-[(2S)-butan-2-yl]-15-[[tert-butyl(diphenyl)silyl]oxymethyl]-19-methyl-9-[(4-nitrophenyl)methoxymethyl]-5,8,11,14,17-pentaoxo-18-(phenylmethoxycarbonylamino)-1-thia-4,7,10,13,16-pentazacyclononadec-2-en-12-yl]propanoate