Methylplatinum triflate coordinated with 1,2-diphenyl-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene serves as a highlyselective catalyst for dehydrogenativesilylation of ketones with HSiMe2Ph in the presence of pyridine as a co-catalyst, giving silyl enol ethers in high yields.
Base-Free Dehydrogenative Coupling of Enolizable Carbonyl Compounds with Silanes
作者:C. David F. Königs、Hendrik F. T. Klare、Yasuhiro Ohki、Kazuyuki Tatsumi、Martin Oestreich
DOI:10.1021/ol301089r
日期:2012.6.1
A dehydrogenative coupling between enolizable carbonyl compounds and equimolar amounts of triorganosilanes catalyzed by a tethered ruthenium complex with a Ru-S bond is reported. The complex Is assumed to fulfill a dual role by activating the Si-H bond to release a silicon electrophile and by abstracting an a-proton from the intermediate silylcarboxonium ion, only liberating dihydrogen as the sole byproduct. Reaction rates are exceedingly high at room temperature with very low loadings of the ruthenium catalyst.
KOREEDA, MASATO;KOO, SANGHO, TETRAHEDRON LETT., 31,(1990) N, C. 831-834