benzyl (4aR,6R,7R,8R,8aR)-7-[(2S,3R,4S,5S,6R)-3,4-bis[[tert-butyl(dimethyl)silyl]oxy]-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-hydroxyoxan-2-yl]oxy-8-[tert-butyl(dimethyl)silyl]oxy-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-3-phenylmethoxy-6,7,8,8a-tetrahydro-4aH-pyrano[3,2-e][1,3,4]oxadiazine-1-carboxylate 、
双丙酮半乳糖 在
三氟化硼乙醚 作用下,
反应 4.0h,
以82%的产率得到benzyl N-[(2R,3R,4R,5R,6R)-5-[(2S,3R,4S,5S,6R)-3,4-bis[[tert-butyl(dimethyl)silyl]oxy]-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-hydroxyoxan-2-yl]oxy-4-[tert-butyl(dimethyl)silyl]oxy-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2-[[(1S,2R,6R,8R,9S)-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecan-8-yl]methoxy]oxan-3-yl]-N-(phenylmethoxycarbonylamino)carbamate