Iridium and B(C6F5)3 co-catalyzed chemoselective deoxygenative reduction of tertiary amides: application to the efficient synthesis and late-stage modification of pharmaceuticals
作者:Feng Han、Guang-Sheng Lu、Dong-Ping Wu、Pei-Qiang Huang
DOI:10.1007/s11426-022-1501-y
日期:——
The Vaska’s complex—tris(pentafluorophenyl)borane combination was found to be a highly efficient cooperative catalysis system for the hydrosilylative reduction of tertiary amides to yield amines under mild conditions. The reaction shows high chemoselectivity, tolerating halide, phenolyl, alkenyl, nitro, nitrile, ester, azido, ketone, and enone functional groups. For unsubstituted cyclohexanone carboxamide
Vaska 的络合物-三(五氟苯基)硼烷组合被发现是一种高效的协同催化体系,可在温和条件下将叔酰胺氢化硅烷化还原成胺。该反应显示出高化学选择性,可耐受卤化物、酚基、烯基、硝基、腈基、酯、叠氮基、酮和烯酮官能团。对于未取代的环己酮甲酰胺,建立了两种变体以实现两个羰基的催化伴随还原或酰胺羰基的选择性还原。该协议适用于多种药物和衍生物的高效合成和后期修饰。重要的是,我们表明,通过简单地将反应时间延长至 24-28 小时,反应可以达到极高的效率,转换数 (TON) 高达 9.8×106和转换频率 (TOF) 高达 408,333 在非常低的催化剂负载 0.00001 mol% (S/C (Ir) = 10,000,000)。