Diastereocontrol for Highly Enantioselective Carbon-Hydrogen Insertion Reactions of Cycloalkyl Diazoacetates
作者:Michael P. Doyle、Alexey B. Dyatkin、Gregory H. P. Roos、Fina Canas、Deborah A. Pierson、Arjan van Basten、Paul Mueller、Philippe Polleux
DOI:10.1021/ja00089a062
日期:1994.5
Intramolecular carbon-hydrogeninsertion of metal carbenes generated by catalytic diazo decomposition of diazocarbonyl compounds is a facile methodology for carbon-carbon bond formation.1-3 Although there are notable exceptions,& five- membered-ring formation is preferred,7J and regioselectivity is generally subject to defined electronic effects.9JO Enantiocontrol has recently been achieved with selected
The decomposition of cyclohexyl diazo(triethylsilyl)acetate 2a and the t-butyl derivatives 3a,b with [Rh-2(S)-ntt}(4)] and similar chiral Rh(II)-catalysts proceeds in toluene at room temperature to produce silylated lactones in up to 90% yield. The reaction is highly stereoselective. Enantioselectivities of up to 79% have been observed. (C) 2003 Elsevier Science Ltd. All rights reserved.