Practical enantioselective Diels-Alder and aldol reactions using a new chiral controller system
作者:E. J. Corey、Rene Imwinkelried、Stanislaw Pikul、Yi Bin Xiang
DOI:10.1021/ja00196a081
日期:1989.7
Catalyse par le complexe cyclique Al [−N(SO 2 CF 3 )(CHPh) 2 (CF 3 SO 2 )N-] R, R=i-Bu, CH 3
催化par le complexe cyclique Al [-N(SO 2 CF 3 )(CHPh) 2 (CF 3 SO 2 )N-] R, R=i-Bu, CH 3
Diastereoselective aldol condensation of directly generated titanium enolates of activated esters.
作者:Rita Annunziata、Mauro Cinquini、Franco Cozzi、Pier Giorgio Cozzi、Emanuela Consolandi
DOI:10.1016/s0040-4020(01)81945-1
日期:1991.9
Simply generated (TiCl4, Et3N, -78-degrees-C) titanium enolates of some thioesters and alpha-thio substituted esters undergo aldol condensations with achiral and chiral aldehydes with low to high stereoselectivity. An H-1-NMR study of the TiCl4/ester complexation and of the enolization process is presented. The relation between the enolate structure and the aldol product stereochemistry is discussed.
HIRAMA MASAHIRO; GARVAY D. S.; LU L. D.-L.; MASAMUNE SATORU, TETRAHEDRON LETT., 1979, NO 41, 3137-3140
作者:HIRAMA MASAHIRO、 GARVAY D. S.、 LU L. D.-L.、 MASAMUNE SATORU
DOI:——
日期:——
Powerful Stereoselective Aldol-type Additions of Phenyl and Phenylthio Esters with Aldehydes or Ketones Mediated by TiCl4/Amine Reagent
An efficient TiCl4/amine-promoted aldol-type addition of phenyl and phenylthio esters with aldehydes or ketones has been performed. The present method includes a practical merit from the green chemical viewpoint with regard to yields, variations of substrates, availability of reagents, and simple operations.