Synthesis of Bis(β‐Oximinoalkyl)malonates and Their Catalytic Reductive Cyclization to Piperidines
作者:Evgeny V. Pospelov、Yaroslav D. Boyko、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/adsc.202200424
日期:2022.8.2
bis(β-oximinoalkyl)malonates were demonstrated to be convenient platforms for the synthesis of saturated N-heterocycles. Upon heterogeneous catalytic hydrogenation, these dioximes undergo reductive cyclization to give substituted piperidine-4,4’-dicarboxylates, which are valuable building blocks in medicinal chemistry. By using dioximes bearing an additional ester group in the side chain, tandem piperidine/pyrrolidinone
迄今为止未知的双(β-肟基烷基)丙二酸酯被证明是合成饱和N的便利平台-杂环。在多相催化氢化后,这些二肟进行还原环化,得到取代的哌啶-4,4'-二羧酸盐,这是药物化学中有价值的组成部分。通过使用在侧链上带有额外酯基的二肟,在这项工作中展示了导致吲哚齐酮骨架的串联哌啶/吡咯烷酮环闭合。初始双(β-肟基烷基)丙二酸酯(对称和不对称取代)的模块化合成是通过将两个亚硝基烯烃分子连续迈克尔加成到丙二酸酯上来完成的。通过同位素扰乱实验和中间体的分离研究了二肟还原环化为哌啶的机理。