A rapid injection NMR study of the chelation controlled Mukaiyama aldol addition: TiCl4 versus LiClO4 as the Lewis acid
作者:Manfred T Reetz、Burkhard Raguse、Charles F Marth、Helmut M Hügel、Thorsten Bach、David N.A Fox
DOI:10.1016/0040-4020(92)80024-a
日期:1992.7
The concept of chelationcontrolled addition to chiral alkoxy aldehydes using Lewisacids and mild C-nucleophiles has been extended to include cyclopropylation. The mechanism of the TiCl4-mediated chelationcontrolled addition of enolsilanes and allylsilanes to chiral α-alkoxy aldehydes has been studied by rapid injection NMR techniques. Accordingly, an acyclic transition state is involved in which
Concerning the role of Lewis acids in chelation controlled addition to chiral alkoxy aldehydes
作者:M.T. Reetz、K. Kesseler、A. Jung
DOI:10.1016/s0040-4039(01)80011-3
日期:1984.1
Chiralα- and β-alkoxyaldehydes react stereoselectively with various C-nucleophiles in the presence of Lewis acids to provide chelation controlled adducts.