A FACILE ASYMMETRIC SYNTHESIS OF β-SUBSTITUTED ALKANOIC ACID THE HIGHLY STEREOSELECTIVE MICHAEL ADDITION OF GRIGNARD REAGENTS TO α,β-UNSATURATED CARBOXYLIC AMIDES DERIVED FROM L-EPHEDRINE
作者:Teruaki Mukaiyama、Nobuharu Iwasawa
DOI:10.1246/cl.1981.913
日期:1981.7.5
The Michael addition of Grignard reagents to chiral α,β-unsaturated carboxylic amides derivedfrom 1-ephedrine affords highly optically active β-substituted alkanoic acids after acid hydrolysis. This high stereoselectivity is explained by considering the formation of rigid internal chelate complexes.
Asymmetric conjugate addition of Grignard reagents in the presence of tertiary amines to α,β-unsaturated amides derived from (S)-2-(1-hydroxy-1-methylethyl)pyrrolidine or (S)-prolinol
作者:Kenso Soai、Hideaki Machida、Atsuhiro Ookawa
DOI:10.1039/c39850000469
日期:——
In the presence of tertiaryamines, diastereoselective conjugateaddition of Grignardreagents to α,β-unsaturatedamides affords 3-substituted carboxylic acids of high enantiomeric excess (up to 89% e.e.).
Soai, Kenso; Machida, Hideaki; Yokota, Noriko, Journal of the Chemical Society. Perkin transactions I, 1987, p. 1909 - 1914
作者:Soai, Kenso、Machida, Hideaki、Yokota, Noriko
DOI:——
日期:——
Enantioselective Carbometalation of Cinnamyl Derivatives: New Access to Chiral Disubstituted Cyclopropanes— Configurational Stability of Benzylic Organozinc Halides
作者:Stephanie Norsikian、Ilan Marek、Sophie Klein、Jean F. Poisson、Jean F. Normant
Enantioselective Carbolithiation of β-Alkylated Styrene
作者:Stephanie Norsikian、Ilane Marek、Jean-F Normant
DOI:10.1016/s0040-4039(97)10022-3
日期:1997.10
Stoichiometric or catalytic amounts of (-) sparteine serve as promoter for enantioselective carbolithiation of beta-alkylated, non functionalized styrene. (C) 1997 Published by Elsevier Science Ltd.