The reaction of CICOOEt with I in a boiling benzene solution leads to the formation of l-carbethoxy-4-piperidone (II) in 76% yield. Condensation of the latter with phenylmagnesium bromide gives l-carbethoxy-4-phenyl-4-piperidinol (III) in 68% yield. The desired end product IV is synthesized in 71.4% yield by treating III with an alcoholic solution of KOH. The overall yield of IV, based on I, is 36
CICOOEt 与 I 在沸腾的苯溶液中的反应导致以 76% 的产率形成 l-carbethoxy-4-piperidone (II)。后者与
溴化苯基
镁的缩合反应以 68% 的产率得到 1-carbethoxy-4-phenyl-4-piperidol (III)。通过用 KOH 的醇溶液处理 III,以 71.4% 的产率合成了所需的最终产物 IV。基于 I 的 IV 总产率为 36.5%。