2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl-(1→2)-3,4,6-tri-O-acetyl-α-D-mannopyranosyl trichloroacetimidate 、
phenyl 2,4-di-O-benzyl-6-O-chloroacetyl-1-thio-α-D-mannopyranoside 在
三氟甲磺酸 、 3 A molecular sieve 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 8.0h,
以84%的产率得到chloro-acetic acid 3,5-bis-benzyloxy-4-[4,5-diacetoxy-6-acetoxymethyl-3-(3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-6-phenylsulfanyl-tetrahydro-pyran-2-ylmethyl ester