2-Alkyloxazolidines (5) were ring-opened by trimethylchlorosilane with N,N-diisopropylamine to give N-[2-(trimethylsilyloxy)alkyll-enamines (6). A MgCl2 promoted Michael reaction of chiral enamines thus prepared was achieved with asymmetric induction.
Reactivite comparee des isomeres imine et enamine silicies: Synthese enantioselective de l'(oxo-2 cyclohexyl)-3 propionate de methyle
作者:Michel Fourtinon、Bernard De Jeso、Jean-Claude Pommier
DOI:10.1016/0022-328x(85)87401-5
日期:1985.7
independently. The silicon-substituted (S)-phenylethylamine derivative adds to methyl acrylate and forms, upon hydrolysis, methyl (S)-3-(2-oxocyclohexyl)propane carboxylate. The tautomeric imine leads to the (R)-enantiomer. Surprisingly, in the presence of a Lewis acid, the ring-containing organosilicon-substituted derivatives show lower stereoselectivity than the corresponding tin compounds.