2,4-di-O-benzyl-3-O-acetyl-D-erythrose 、
(Diethoxy-phosphoryl)-((2R,3R,4S,5R,6S)-3,4,5-tris-benzyloxy-6-methoxy-tetrahydro-pyran-2-ylmethoxy)-acetic acid ethyl ester 在
potassium hydride 作用下,
以44%的产率得到methyl 6-O-<(3'S,4'R)-4'-acetoxy-3',5'-dibenzyloxy-1'-ethoxycarbonylpent-1-1'(Z)-enyl>-2,3,4-tri-O-benzyl-α-D-glucopyranoside