Straightforward Access to Terminally Disubstituted Electron‐Deficient Alkylidene Cyclopent‐2‐en‐4‐ones through Olefination with α‐Carbonyl and α‐Cyano Secondary Alkyl Sulfones
作者:Lena Trifonov、Ayelet Rothstein、Edward E. Korshin、Olga Viskind、Michal Afri、Gregory Leitus、Krzysztof Palczewski、Arie Gruzman
DOI:10.1002/ejoc.202101258
日期:2021.12.28
A straightforward synthesis of virtually unexplored terminally disubstituted electron-deficient alkylidene cyclopent-2-en-4-ones was elaborated using activated secondary sulfones as alkylidene anion-radical synthons. The presented olefination process is proposed to rely on a base-promoted tandem or sequential Michael addition of C-nucleophiles to 4-acyl- or 4-silyloxycyclopent-2-en-1-ones followed
使用活化的仲砜作为亚烷基阴离子自由基合成子,详细阐述了几乎未探索的末端双取代的缺电子亚烷基环戊二烯环戊二烯的直接合成。提出的烯化过程依赖于碱促进的串联或顺序迈克尔加成 C-亲核试剂到 4-酰基-或 4-甲硅烷氧基环戊-2-en-1-ones,然后是逆-迈克尔 O-和 S-核离心机消除。