Efficient and Selective Hydrosilylation of Secondary and Tertiary Amides Catalyzed by an Iridium(III) Metallacycle: Development and Mechanistic Investigation
作者:Yann Corre、Xavier Trivelli、Frédéric Capet、Jean-Pierre Djukic、Francine Agbossou-Niedercorn、Christophe Michon
DOI:10.1002/cctc.201700400
日期:2017.6.8
Readily accessible cationic IrIII metallacycles catalyze efficiently the chemoselective hydrosilylation of tertiary and secondary amides to amines. The catalyst described herein operates at low loadings using inexpensive 1,1,3,3-tetramethyldisiloxane and allows fast reactions with high yields, selectivities, and turnover numbers. A transient iminium intermediate has been observed for the first time
易于获得的阳离子Ir III金属环有效催化叔酰胺和仲酰胺向胺的化学选择性氢化硅烷化。本文所述的催化剂使用廉价的1,1,3,3-四甲基二硅氧烷在低负荷下操作,并允许以高产率,选择性和周转数进行快速反应。通过质谱法首次观察到了过渡亚胺鎓中间体,并通过DFT计算研究了催化剂和硅烷试剂的活化。这些基本见解通过适当的配体修饰来支持Ir III金属环的当前和未来的改进,并使基于金属环的催化剂能够进一步广泛应用。