乙酸酐 、 [(2R,3R,6S)-6-(Acetylamino-methyl)-2-((1R,2S,3R,4S,5R,6R)-2-benzyloxycarbonylamino-3,5,6-trihydroxy-4-nitro-cyclohexyloxy)-tetrahydro-pyran-3-yl]-carbamic acid benzyl ester 在
三氟化硼乙醚 作用下,
生成
Acetic acid (1S,2R,3S,4R,5S,6R)-2,4-diacetoxy-6-[(2R,3R,6S)-6-(acetylamino-methyl)-3-benzyloxycarbonylamino-tetrahydro-pyran-2-yloxy]-5-benzyloxycarbonylamino-3-nitro-cyclohexyl ester