Organocatalytic Asymmetric Addition of Alcohols and Thiols to Activated Electrophiles: Efficient Dynamic Kinetic Resolution and Desymmetrization Protocols
摘要:
[GRAPHICS]Bifunctional urea-based cinchona alkaloid derivatives have been shown to promote highly efficient DKR reactions of azalactones using an alcohol nucleophile. The optimum catalyst is remarkably insensitive to the steric bulk of the amino acid residue, allowing alanine, methionine, and phenylalanine-derived azalactones to undergo DKR with unprecedented levels of enantio selectivity using a synthetic catalyst. The first DKR of these substrates by thiols and the highly enantioselective desymmetrization of a meso-glutaric anhydride by thiolysis are also reported.
Organocatalytic Asymmetric Addition of Alcohols and Thiols to Activated Electrophiles: Efficient Dynamic Kinetic Resolution and Desymmetrization Protocols
摘要:
[GRAPHICS]Bifunctional urea-based cinchona alkaloid derivatives have been shown to promote highly efficient DKR reactions of azalactones using an alcohol nucleophile. The optimum catalyst is remarkably insensitive to the steric bulk of the amino acid residue, allowing alanine, methionine, and phenylalanine-derived azalactones to undergo DKR with unprecedented levels of enantio selectivity using a synthetic catalyst. The first DKR of these substrates by thiols and the highly enantioselective desymmetrization of a meso-glutaric anhydride by thiolysis are also reported.
Organocatalytic Asymmetric Addition of Alcohols and Thiols to Activated Electrophiles: Efficient Dynamic Kinetic Resolution and Desymmetrization Protocols
作者:Aldo Peschiulli、Cormac Quigley、Seán Tallon、Yuri K. Gun’ko、Stephen J. Connon
DOI:10.1021/jo801158g
日期:2008.8.1
[GRAPHICS]Bifunctional urea-based cinchona alkaloid derivatives have been shown to promote highly efficient DKR reactions of azalactones using an alcohol nucleophile. The optimum catalyst is remarkably insensitive to the steric bulk of the amino acid residue, allowing alanine, methionine, and phenylalanine-derived azalactones to undergo DKR with unprecedented levels of enantio selectivity using a synthetic catalyst. The first DKR of these substrates by thiols and the highly enantioselective desymmetrization of a meso-glutaric anhydride by thiolysis are also reported.