2-{(4S,5R,6R)-6-[(S)-(4-Methoxy-benzyloxy)-phenyl-methyl]-2,2,5-trimethyl-[1,3]dioxan-4-yl}-ethanol 在
pyridine-SO3 complex 作用下,
以
二氯甲烷 为溶剂,
生成 (E)-4-{(4S,5R,6R)-6-[(S)-(4-Methoxy-benzyloxy)-phenyl-methyl]-2,2,5-trimethyl-[1,3]dioxan-4-yl}-but-2-enoic acid ethyl ester