A simple and efficient synthesis of polysubstituted 4-piperidones was achieved from the double Mannichreaction of β-keto esters and bisaminol ethers. The reaction is highly diastereoselective, as is the subsequent hydride reduction, to give polysubstituted 4-piperidols.
A double Mannich approach to the synthesis of substituted piperidones—application to the synthesis of substituted E-ring analogues of methyllycaconitine
作者:Yinman Chan、Jared Balle、J. Kevin Sparrow、Peter D.W. Boyd、Margaret A. Brimble、David Barker
DOI:10.1016/j.tet.2010.06.084
日期:2010.8
The double Mannich reaction of acyclic α,γ-substituted β-keto esters and bis(aminol) ethers gives substituted 3,5-substituted-4-piperidones with high levels of diastereoselectivity. These piperdiones can be easily transformed into substituted E-ring analogues of the delphinium alkaloid methyllycacotine.