Synthesis of Regioisomeric Pyrido[<i>c</i>]azocanones from Azaindanone Derivatives
作者:Miriam Penning、Jens Christoffers
DOI:10.1002/ejoc.201301736
日期:2014.4
A ring enlargement reaction with methylamine gave new pyrido[2,3-c]-, pyrido[3,4-c]- and pyrido[3,2-c]azocanone derivatives from cyclic β-oxo esters with a cyclopentapyridine skeleton and a 1,4-diketone moiety. The starting materials for this ring transformation were either prepared from halogenopyridine carboxylates by Heck reaction and subsequent hydrogenation, or (halogenomethyl)pyridine carboxylates
与甲胺的扩环反应产生了新的吡啶并[2,3-c]-、吡啶并[3,4-c]-和吡啶并[3,2-c]偶氮烷酮衍生物,这些衍生物来自具有环戊吡啶骨架和1,4-二酮部分。这种环转化的起始原料是通过 Heck 反应和随后的氢化从卤代吡啶羧酸盐制备的,或者(卤代甲基)吡啶羧酸盐与丙二酸二乙酯进行 SN 反应。这两条路线都是通过 Dieckmann 缩合来构建环状 β-氧代酯结构和用苯甲溴化物烷基化以安装 1,4-二酮基序来完成的。