title: Progress toward the total synthesis of callipeltin A (I): asymmetric synthesis of (3S,4R)-3,4-dimethylglutamine.
abstract: [reaction:see text] During the total synthesis of the novel cyclic depsipeptide callipeltin A (1), the unit (3S,4R)-3,4-dimethylglutamine, was successfully synthesized by asymmetric Michael addition and subsequent electrophilic azidation. The key feature of this approach is the generation of three adjacent stereogenic centers using the same camphorsultam chiral auxiliary.
authors.affiliation: Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
authors.forename: B
authors.initials: B
authors.lastname: Liang
authors.forename: P J
authors.initials: PJ
authors.lastname: Carroll
authors.forename: M M
authors.initials: MM
authors.lastname: Joullié
mesh_terms: D047630:Depsipeptides; D005973:Glutamine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: C419323:3,4-dimethylglutamine; D047630:Depsipeptides; D010456:Peptides, Cyclic; C418139:callipeltin A; D005973:Glutamine