Catalytic cyanomethylation of carbonyl compounds and imines with highly basic phosphine
作者:Satoru Matsukawa、Eri Kitazaki
DOI:10.1016/j.tetlet.2008.02.155
日期:2008.4
A highly basicphosphine, tris(2,4,6-trimethoxy phenyl)phosphine (TTMPP), catalyzes cyanomethylation using trimethylsilylacetonitrile (TMSCH2CN) to give the corresponding products in good to high yields, with both carbonyl compounds and imines.
Catalytic cyanomethylation of various carbonyl compounds with (trimethylsilyl)acetonitrile (TMSCH2CN) in the presence of Lewis bases such as cesium or lithium acetate proceeded smoothly to afford t...
mild amine basic conditions is described. A cooperative catalysis of CpRu complex, DBU, and NaPF6 enables chemoselective and catalytic generation of nucleophiles from barely acidic acetonitrile, which is integrated into the addition to aldehydes, imines, and activated ketones. Mechanistic investigations revealed that the three catalyst components work together to achieve high catalytic efficiency.
An aldol-type reaction of organonitriles with aldehydes was catalyzed by a RhI(OR) species underambientconditions, and the reaction displayed a broad substrate scope with respect to both organonitrile and aldehyde components.
combination of the catalytic triad enabled catalyticactivation of acetonitrile as a nucleophile under mild amine-basic conditions. Addition of in situ-generated, Ru-bound, metalated nitrile to aldehydes and imines proceeded smoothly with 2.5-5 mol % Ru complex and 2.5-10 mol % DBU in the presence of 10 mol % NaPF6. Preliminary mechanistic studies suggested a role for each of the three catalytic components