(6S,7R)-8-[1-Hydroxy-meth-(E)-ylidene]-9-oxo-6-(3,4,5-trimethoxy-phenyl)-2,3,6,7,8,9-hexahydro-naphtho[2,3-b][1,4]dioxine-7-carboxylic acid ethyl ester 在
sodium tetrahydroborate 作用下,
以
甲醇 为溶剂,
反应 10.0h,
以72%的产率得到Ethyl 6,7-ethylenedioxy-1,2,3,4-tetrahydro-4-(3',4',5'-trimethoxyphenyl)-1-oxo-3-naphthoate