Trends in Asymmetric Michael Reactions Catalysed by Tripeptides in Combination with an Achiral Additive in Different Solvents
作者:Svetlana B. Tsogoeva、Sunil B. Jagtap、Zoya A. Ardemasova、Victor N. Kalikhevich
DOI:10.1002/ejoc.200400243
日期:2004.10
as chiral catalysts for asymmetric Michael addition reactions in the presence of an achiral additive has been tested in different solvents (CHCl3, acetone, DMF, DMSO and the room-temperature ionic liquid [bmim]PF6). The dependence of yields and enantiomeric excesses on the solvent used has been demonstrated. The experiments show that the combination of additive and peptides provides a catalytic system
A versatile organocatalyst for the asymmetric conjugate addition of nitroalkanes to enones
作者:Claire E. T. Mitchell、Stacey E. Brenner、Steven V. Ley
DOI:10.1039/b511441a
日期:——
5-Pyrrolidin-2-yltetrazole performs as an improved catalyst for the asymmetricaddition of a range of nitroalkanes to cyclic and acyclic enones, with good to excellent enantioselectivity.