Construction of N-Acylated 4-Piperidones via Selective Carbon-Nitrogen and Carbon-Carbon Bond Formation
作者:Mitsumasa Takahashi、Keiji Tanino、Isao Kuwajima
DOI:10.1246/cl.1993.1655
日期:1993.10
N-Acylated 4-piperidone was prepared in good overall yield through an initial formation of the imine from the reaction of α′-aminomethylated enol silyl ether with an aldehyde followed by cyclization effected with an acid anhydride. The latter cyclization reaction seems to proceed preferentially through a boat-like transition state to give the piperidone having exo substituent.
通过α'-氨甲基化烯醇甲硅烷基醚与醛的反应首先形成亚胺,然后用酸酐进行环化,以良好的总产率制备了N-酰化4-哌啶酮。后者的环化反应似乎优先通过船状过渡态进行,得到具有外型取代基的哌啶酮。