作者:Nicole L. Lampland、Megan Hovey、Debabrata Mukherjee、Aaron D. Sadow
DOI:10.1021/acscatal.5b01038
日期:2015.7.2
information on catalyst activation in hand, tertiary amides are selectively reduced to amines in good yield when catalytic amounts of ToMMgMe are added to a mixture of amide and excess HBpin. In addition, secondary amides are reduced in the presence of 10 mol % ToMMgMe and 4 equiv of HBpin. Functional groups such as cyano, nitro, and azo remain intact under the mild reaction conditions. In addition, kinetic experiments
报道了酰胺催化加氢硼化以将其脱氧为胺的第一个实例。该转化采用了富含地球的镁基催化剂。叔酰胺和仲酰胺在频哪醇硼烷(HBpin)和催化量的To M MgMe(To M =三(4,4-二甲基-2-恶唑啉基)苯基硼酸酯)存在下于室温还原为胺。如催化实验中底物和HBpin的浓度和添加顺序的影响所揭示的,在该系统中催化剂的引发和形成是复杂的。由To M MgMe和HBpin形成的To M MgH 2 Bpin被排除为可能的催化相关物种,因为它与N发生了反应,N-二甲基苯甲酰胺,分别通过C–N和C–C键裂解途径提供Me 2 NBpin和PhBpin。在该反应中,仅以低收率形成催化产物苄基二甲基胺。或者,To M MgMe与N,N-二甲基苯甲酰胺的反应在24小时内缓慢分解为To M MgMe,并且该相互作用也被排除为催化相关步骤。总之,这些数据表明,To M MgMe的催化活化需要HBpin和酰胺,以及To