丁二酸酐 、 2,2-Dimethyl-propionic acid (2R,3R,4S,5S,6R)-3,5-bis-(2,2-dimethyl-propionyloxy)-2-(2,2-dimethyl-propionyloxymethyl)-6-(3'-ethoxycarbonylmethyl-biphenyl-2-yloxy)-tetrahydro-pyran-4-yl ester 在
三氯化铝 作用下,
以
1,2-二氯乙烷 为溶剂,
以13.35 g的产率得到4-{3'-Ethoxycarbonylmethyl-6-[(2R,3S,4S,5R,6R)-3,4,5-tris-(2,2-dimethyl-propionyloxy)-6-(2,2-dimethyl-propionyloxymethyl)-tetrahydro-pyran-2-yloxy]-biphenyl-3-yl}-4-oxo-butyric acid