(S)-2-[(2R,3S,4S,5R,6R)-3,5-Diacetoxy-2-acetoxymethyl-6-(2,2,2-trichloro-acetimidoyloxy)-tetrahydro-pyran-4-yloxy]-propionic acid methyl ester 、
3-Azidopropyl O-(3-O-benzyl-6-O-chloroacetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->3)-O-(2,4,6-tri-O-acetyl-β-D-galactopyranosyl)-(1->4)-2,3,6-tri-O-acetyl-β-D-glucopyranoside 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,
以50%的产率得到3-Azidopropyl O-{2,4,6-tri-O-acetyl-3-O-[(S)-1-(methoxycarbonyl)ethyl]-β-D-galactopyranosyl}-(1->4)-O-(3-O-benzyl-6-O-chloroacetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->3)-O-(2,4,6-tri-O-acetyl-β-D-galactopyranosyl)-(1->4)-2,3,6-tri-O-...