Acetic acid (2R,3S,4R,5R,6S)-2-benzyloxymethyl-3-(tert-butyl-dimethyl-silanyloxy)-5-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-6-(2,2,2-trichloro-acetimidoyloxy)-tetrahydro-pyran-4-yl ester 、
[(2S,3R,4R,5S,6R)-2-[(2R,3S,4R,5R,6R)-4-acetyloxy-5-(1,3-dioxoisoindol-2-yl)-2-(phenylmethoxymethyl)-6-prop-2-enoxyoxan-3-yl]oxy-3-(1,3-dioxoisoindol-2-yl)-5-hydroxy-6-(phenylmethoxymethyl)oxan-4-yl] acetate 在
三氟化硼乙醚 作用下,
以61%的产率得到[(2R,3S,4R,5R,6R)-3-[(2S,3R,4R,5S,6R)-4-acetyloxy-5-[(2S,3R,4R,5S,6R)-4-acetyloxy-5-[tert-butyl(dimethyl)silyl]oxy-3-(1,3-dioxoisoindol-2-yl)-6-(phenylmethoxymethyl)oxan-2-yl]oxy-3-(1,3-dioxoisoindol-2-yl)-6-(phenylmethoxymethyl)oxan-2-yl]oxy-5-(1,3-dioxoisoindol-2-yl)-2-(phenylmethoxymethyl)-6-prop-2-enoxyoxan-4-yl] acetate