Acetic acid (2S,3R,4S,5R,6S)-5-acetoxy-2-acetoxymethyl-4-benzyloxy-6-fluoro-tetrahydro-pyran-3-yl ester 、 Benzoic acid (2R,3S,4R,5R,6S)-4-acetoxy-5-benzyloxycarbonylamino-3-hydroxy-6-methoxy-2-methyl-tetrahydro-pyran-2-ylmethyl ester 在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
以73%的产率得到Benzoic acid (2R,3S,4R,5R,6S)-4-acetoxy-5-benzyloxycarbonylamino-3-((2S,3R,4S,5R,6S)-3,5-diacetoxy-6-acetoxymethyl-4-benzyloxy-tetrahydro-pyran-2-yloxy)-6-methoxy-tetrahydro-pyran-2-ylmethyl ester