title: Total synthesis of (-)-kaitocephalin.
abstract: [reaction: see text] Total synthesis of the potent AMPA/KA receptor antagonist (-)-kaitocephalin (1) and its three diastereomers has been accomplished. The synthesis features strictly substrate-controlled operations to alpha-formylglutamate 3 starting with alpha-hydroxymethylglutamate 4. The requisite 2R,3S,7R-stereocenters were efficiently constructed by manipulation of stereoselective reactions: dihydroxylation of 7 followed by azide substitution of the corresponding thionocarbonate 10 and Cu-mediated allylation of an acyliminium ion 21. All of the protecting groups in 26 were removed simultaneously by AlCl3/Me2S to give 1.
authors.affiliation: Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi, Osaka 558-8585, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Kawasaki
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Shinada
authors.forename: Makoto
authors.initials: M
authors.lastname: Hamada
authors.forename: Yasufumi
authors.initials: Y
authors.lastname: Ohfune
mesh_terms: D007769:Lactams / Q000737:chemistry; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D007769:Lactams; D011758:Pyrroles; C442421:kaitocephalin