<scp>4‐Dimethylaminopyridine‐Boryl</scp>
Radical Promoted Monodefluorinative Alkylation of 3,
<scp>3‐Difluorooxindoles</scp>
作者:Tesfaye Tebeka Simur、Fentahun Wondu Dagnaw、You‐Jie Yu、Feng‐Lian Zhang、Yi‐Feng Wang
DOI:10.1002/cjoc.202100784
日期:2022.3
A selective monodefluorinative alkylation of 3,3-difluorooxindoles is achieved. The reaction starts by the attack of a 4-dimethylaminopyrine-boryl radical to the carbonyl oxygen atom of 3,3-difluorooxindoles, followed by a spin-center shift to generate radical intermediates with the elimination of a fluoride anion. The subsequent radical addition to alkenes affords a range of 3-alkyl-fluorooxindoles
实现了 3,3-二氟羟吲哚的选择性单脱氟烷基化。该反应开始于 4-二甲基氨基吡啶-硼基自由基对 3,3-二氟羟吲哚的羰基氧原子的攻击,随后自旋中心位移生成自由基中间体,同时消除了一个氟阴离子。随后对烯烃进行自由基加成,得到一系列 3-烷基-氟羟吲哚产物。该策略提供了获得具有广泛底物范围并耐受多种官能团的 C-3 官能化羟吲哚的途径。