In the course of an attempted synthesis of E-norvincamine (4) (−)-15-oxovincamone (7), prepared from (−)-vincamone (2), was converted by means of methanolic sodium methoxide to give the (−)-11-cis and (±)-12-trans alcohols. Alkaline hydrolysis of the dioxo compound 7 furnishes the α-oxo acids 8 and 9 as a result of an epimerization-racemization process.
在尝试合成的过程中,通过
甲醇甲醇钠将由(-)-长春花酮(2)制备的E-去甲
长春胺(4)(-)-15-氧代辛卡酮(7)转化为(-) - 11 -顺式和(±) - 12 -反式醇。由于差向异构-外消旋过程,二氧杂化合物7的碱性
水解提供了α-氧杂酸8和9。