Mild Divergent Semireductive Transformations of Secondary and Tertiary Amides via Zirconocene Hydride Catalysis
作者:Rebecca A. Kehner、Ge Zhang、Liela Bayeh-Romero
DOI:10.1021/jacs.2c11786
日期:2023.3.8
glovebox handling. Moreover, a novel reductive transamination of tertiary amides is also achievable when the catalytic protocol is carried out in the presence of a primary amine at room temperature, providing access to an expanded assortment of imines in up to 98% yield. Through slight procedural tuning, the single-flask conversion of amides to imines, aldehydes, amines or enamines is feasible, including
酰胺温和催化部分还原为亚胺已被证明是一种具有挑战性的合成转化,许多过渡金属直接将这些底物还原为胺。在此,我们报告了一种通过二茂氢化物催化半还原仲酰胺和叔酰胺的温和催化方法。仅使用 5 mol% 的 Cp 2 ZrCl 2 ,仲酰胺的还原脱氧即可提供多种亚胺,产率高达 94%,具有优异的化学选择性,且无需手套箱操作。此外,当催化方案在伯胺存在下于室温下进行时,也可以实现叔酰胺的新型还原氨基转移,从而以高达 98% 的收率获得更多的亚胺。通过轻微的程序调整,酰胺到亚胺、醛、胺或烯胺的单烧瓶转化是可行的,包括多组分合成。