Two one-pot procedures starting from diethyl 3,3-diethoxybutyl-phosphanate and aldehydes are proposed for the stereoselective synthesis of the title compounds. In the first one, the use of a Peterson reagent generated in situ, leads to a high (Z)-stereoselective olefination process. In the second, a base-induced 1,2-elimination reaction of a phosphate derivative controls the (E)-stereoselective formation of the double bond.
提出了两种从
二乙基3,3-二乙氧基丁基
膦酸酯和醛出发的一锅法程序,用于立体选择性合成标题化合物。在第一种方法中,原位生成的彼得森试剂促进了高(Z)立体选择性的烯烃化过程。在第二种方法中,
磷酸酯衍
生物的碱诱导的1,2-消除反应控制了(E)立体选择性形成双键。