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.
A stereocontrolled synthesis of trans-alkene isosteres of dipeptides
作者:Andreas Spaltenstein、Philip A Carpino、Fumio Miyake、Paul B Hopkins
DOI:10.1016/s0040-4039(00)84457-3
日期:1986.1
A general synthetic route to trans-alkene isosteres of protecteddipeptides is reported. This sequence permits the fullystereocontrolled preparation of these isosteres in optically active form and in quantities sufficient for further biological study. Prepared in this manner were alkene isosteres of TyrAla. PhePhe, and LeuLeu.