4-O-acetyl-3-O-(tert-butyldimethylsilyl)-2-deoxy-2-thiophenyl-6-O-p-toluenesulfonyl-1-trichloroacetimido-α-D-glucopyranose 、
Acetic acid (2S,3S,4S,5R,6R)-2-bromomethyl-4-hydroxy-5-phenylsulfanyl-6-(2-trimethylsilanyl-ethoxy)-tetrahydro-pyran-3-yl ester 在
三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
生成 2-(trimethylsilyl)ethyl 4-O-acetyl-3-O-[4-O-acetyl-3-O-(tert-butyldimethylsilyl)-2-deoxy-2-thiophenyl-6-O-p-toluenesulfonyl-α-D-glucopyranosyl]-6-bromo-2,6-dideoxy-2-thiophenyl-β-D-glucopyranose 、 2-(trimethylsilyl)ethyl 4-O-acetyl-3-O-[4-O-acetyl-3-O-(tert-butyldimethylsilyl)-2-deoxy-2-thiophenyl-6-O-p-toluenesulfonyl-β-D-glucopyranosyl]-6-bromo-2,6-dideoxy-2-thiophenyl-β-D-glucopyranose