[(2S,3S,4R,5R,6S)-3-methoxy-5-[(2S,3R,4R,5S,6S)-5-methoxy-6-methyl-3,4-bis(phenylmethoxy)oxan-2-yl]oxy-6-methyl-4-phenylmethoxyoxan-2-yl] acetate 、
(2S,3R,4R,5R,6S)-2-[(2R,3R,4R,5R,6S)-2-methoxy-6-methyl-4,5-bis(phenylmethoxy)oxan-3-yl]oxy-6-methyl-3,5-bis(phenylmethoxy)oxan-4-ol 在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
以50%的产率得到(2S,3S,4R,5R,6S)-3-methoxy-5-[(2S,3R,4R,5S,6S)-5-methoxy-6-methyl-3,4-bis(phenylmethoxy)oxan-2-yl]oxy-2-[(2S,3R,4R,5S,6S)-2-[(2R,3R,4R,5R,6S)-2-methoxy-6-methyl-4,5-bis(phenylmethoxy)oxan-3-yl]oxy-6-methyl-3,5-bis(phenylmethoxy)oxan-4-yl]oxy-6-methyl-4-phenylmethoxyoxane