Zinc catalysis: Zinc triflate in a nitrile solvent behaved as an effective catalyst for dehydrogenative N‐silylation with a variety of indoles and hydrosilanes (see scheme). The addition of pyridine greatly accelerated the N‐silylation reaction to produce N‐silylindoles exclusively in high to excellent yields.
Catalytic dehydrogenative Si–N coupling of pyrroles, indoles, carbazoles as well as anilines with hydrosilanes without added base
作者:C. David F. Königs、Maria F. Müller、Nuria Aiguabella、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1039/c3cc38900f
日期:——
A base-free, catalytic protocol for the dehydrogenative Si-N coupling of weakly nucleophilic N-H groups of heteroarenes or aryl-substituted amines with equimolar amounts of hydrosilanes is reported. Cooperative Si-H bond activation at a Ru-S bond generates a silicon electrophile that forms a Si-N bond prior to the N-H deprotonation by an intermediate Ru-H complex, only releasing H(2).