2,3,4,6-tetra-O-benzyl-α-D-mannopyranoside 、
(R)-4-Benzyloxy-3-((S)-2,2-dimethyl-5-phenylsulfanyl-[1,3]dioxolan-4-yl)-butyric acid 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
苯 为溶剂,
以80%的产率得到(R)-4-Benzyloxy-3-((S)-2,2-dimethyl-5-phenylsulfanyl-[1,3]dioxolan-4-yl)-butyric acid (2R,3S,4S,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl ester