Salaverri Noelia, Carli Benedetta, Díaz-Tendero Sergio, Marzo Leyre, Alemán José
Departamento de Química Orgánica (Módulo 1), Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain.
Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049, Madrid, Spain.
Org Lett. 2022 May 6;24(17):3123-3127. doi: 10.1021/acs.orglett.2c00662. Epub 2022 Apr 1.
Herein, we report the enantioselective addition of remote alkyl radicals, generated from the ring opening of unstrained cycloalkanols by a proton-coupled electron transfer (PCET) process, to 2-acyl imidazoles previously coordinated to a rhodium-based chiral Lewis acid. High yields and enantioselectivites up to 99% are achieved in 1 h. Mechanistic investigations support the formation of the remote alkyl radical by a PCET process, and theoretical studies explain the observed stereochemistry in the addition step.
在此,我们报道了通过质子耦合电子转移(PCET)过程从无张力环烷醇开环产生的远程烷基自由基对先前与铑基手性路易斯酸配位的2-酰基咪唑的对映选择性加成反应。在1小时内实现了高达99%的高产率和对映选择性。机理研究支持通过PCET过程形成远程烷基自由基,理论研究解释了加成步骤中观察到的立体化学。