(5-methyl-2-p-tolyl-oxazol-4-ylmethyl)-triphenyl-phosphonium chloride 、 [cis]-2-methyl-5-(3-oxo-propyl)-[1,3]dioxane-2-carboxylic acid ethyl ester 在
正丁基锂 作用下,
以
四氢呋喃 为溶剂,
反应 2.5h,
生成 Z-[cis]-2-methyl-5-[4-(5-methyl-2-p-tolyl-oxazol-4-yl)-but-3-enyl]-[1,3]dioxane-2-carboxylic acid ethyl ester 、 E-[cis]-2-methyl-5-[4-(5-methyl-2-p-tolyl-oxazol-4-yl)-but-3-enyl]-[1,3]dioxane-2-carboxylic acid ethyl ester