乙酸酐 、
(2R,3R,4S,5R,6S)-4,5-Bis-benzyloxy-6-methoxy-2-[2-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-ethyl]-tetrahydro-pyran-3-ol 在
4-二甲氨基吡啶 吡啶 作用下,
以89%的产率得到Acetic acid (2R,3R,4S,5R,6S)-4,5-bis-benzyloxy-6-methoxy-2-[2-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-ethyl]-tetrahydro-pyran-3-yl ester