Regiospecific ring-opening reactions of β-aziridinyl α,β-enoates with acids: application to the stereoselective synthesis of a couple of diastereoisomeric (E )-alkene dipeptide isosteres from a single β-aziridinyl α,β-enoate and to the convenient preparation of amino alcohols bearing α,β-unsaturated ester groups
A Thermodynamic Preference of Chiral N-Methanesulfonyl and N-Arenesulfonyl 2,3-cis-3-Alkyl-2-Vinylaziridines over Their 2,3-Trans-Isomers: Useful Palladium(0)-Catalyzed Equilibration Reactions for the Synthesis of (E)-Alkene Dipeptide Isosteres
摘要:
Palladium(0)-catalyzed reactions of N-methanesulfonyl- or N-(arenesulfonyl)-3-alkyl-2-vinylaziridines reveal that 2,3-cis-isomers are more stable than the corresponding 2,3-trans-isomers in accord with ab initio calculations. A highly stereoselective synthetic route to (E)-alkene dipeptide isosteres having desired stereochemistries from 2,3-cis-3-isobutyl-2-vinylaziridine by the use of organocopper chemistry is also presented.
Stereoselective vinylation of amino aldehydes using 2-trimethylsilylethylidentriphenylphosphorane
作者:Maurizio Franciotti、André Mann、Maurizio Taddei
DOI:10.1016/s0040-4039(00)93602-5
日期:1991.11
2-Trimethylsilylethylidentriphenylphosphorane reacts stereoselectively with α-amino aldehydes giving the Cram chelation controlled product of vinylation of the carbonyl group. The olefinic 1,2-amino alcohols obtained with this reaction are important intermediates for the preparation of peptides analogues and they were employed for the preparation of N-Boc-statine.