硫代乙酸 、
O-[2-azido-3,4-di-O-benzyl-6-O-{3',6'-di-O-benzyl-2'-deoxy-2'-(4,5-dichlorophthalimido)-4'-O-(3'',4'',6''-tri-O-benzyl-2''-O-p-toluoyl-β-D-galactopyranosyl)-β-D-glucopyranosyl}-2-deoxy-α-D-galactopyranosyl]-N-(benzyloxycarbonyl)-L-serine benzyl ester 在
吡啶 作用下,
以85%的产率得到[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6R)-6-[[(2R,3R,4R,5R,6S)-5-acetamido-6-[(2S)-3-oxo-3-phenylmethoxy-2-(phenylmethoxycarbonylamino)propoxy]-3,4-bis(phenylmethoxy)oxan-2-yl]methoxy]-5-(5,6-dichloro-1,3-dioxoisoindol-2-yl)-4-phenylmethoxy-2-(phenylmethoxymethyl)oxan-3-yl]oxy-4,5-bis(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-3-yl] 4-methylbenzoate