Nickel-Catalyzed Diaryl Ketone Synthesis by N–C Cleavage: Direct Negishi Cross-Coupling of Primary Amides by Site-Selective <i>N</i>,<i>N</i>-Di-Boc Activation
作者:Shicheng Shi、Michal Szostak
DOI:10.1021/acs.orglett.6b02952
日期:2016.11.18
the first amide cross-coupling by direct metal insertion of simple and readily available primary amides. The overall strategy by N,N-di-Boc activation/metal insertion is suitable for a broad range of coupling protocols via acylmetals. Mechanistic experiments suggest high reactivity of N,N-di-Boc activated 1° amides in direct amide C–N cross-couplings.
首次报道了通过位点选择性N,N -di-Boc活化和镍催化的组合实现的伯酰胺的一般Negishi酰化反应。稳定的,廉价的镍催化剂促进了反应的进行。该反应显示出优异的官能团相容性,可通过选择性N-C裂解获得官能化的二芳基酮。最值得注意的是,该方案代表了通过直接金属插入简单易得的伯酰胺而进行的第一个酰胺交叉偶联。N,N -di-Boc活化/金属插入的整体策略适用于广泛的通过酰基金属的偶联方案。力学实验表明N,N具有高反应活性-di-Boc在酰胺直接C–N交叉偶联中活化了1°酰胺。