甲基2,3,4-三-O-苄基-α-D-吡喃葡萄糖苷 、
O-[(2R,3S,4S,5R,6S)-6-fluoro-4,5-bis(phenylmethoxy)-2-(phenylmethoxymethyl)oxan-3-yl] N,N-diethylcarbamothioate 在
三氟甲磺酸 、 5A molecular sieve 作用下,
以
乙醚 为溶剂,
反应 1.5h,
以97%的产率得到O-[(2R,3S,4S,5R,6S)-6-[[(2R,3R,4S,5R,6S)-6-methoxy-3,4,5-tris(phenylmethoxy)oxan-2-yl]methoxy]-4,5-bis(phenylmethoxy)-2-(phenylmethoxymethyl)oxan-3-yl] N,N-diethylcarbamothioate