title: Organocatalytic asymmetric addition of alcohols and thiols to activated electrophiles: efficient dynamic kinetic resolution and desymmetrization protocols.
abstract: 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 enantioselectivity 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.
authors.affiliation: Centre for Synthesis and Chemical Biology, School of Chemistry, University of Dublin, Trinity College, Dublin 2, Ireland.
authors.forename: Aldo
authors.initials: A
authors.lastname: Peschiulli
authors.forename: Cormac
authors.initials: C
authors.lastname: Quigley
authors.forename: Seán
authors.initials: S
authors.lastname: Tallon
authors.forename: Yuri K
authors.initials: YK
authors.lastname: Gun'ko
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Connon
mesh_terms: D000409:Alanine / Q000031:analogs & derivatives / Q000737:chemistry; D000438:Alcohols / Q000737:chemistry*; D000596:Amino Acids / Q000737:chemistry*; D000812:Anhydrides / Q000737:chemistry; D002930:Cinchona Alkaloids / Q000737:chemistry*; D007700:Kinetics; D007783:Lactones / Q000737:chemistry*; D020005:Propanols / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014508:Urea / Q000031:analogs & derivatives; D014633:Valine / Q000031:analogs & derivatives
chemical_list: D000438:Alcohols; D000596:Amino Acids; D000812:Anhydrides; D002930:Cinchona Alkaloids; D007783:Lactones; D020005:Propanols; D013438:Sulfhydryl Compounds; C047207:N-benzoylalanine; C006463:allyl alcohol; D014508:Urea; D014633:Valine; D000409:Alanine