title: Asymmetric total syntheses of marine cyclic depsipeptide halipeptins A-D.
abstract: Halipeptins A-D (1 a-d) are a family of natural cyclic depsipeptides isolated from marine sponges. Total syntheses of these four compounds are detailed in this report. The key elements in this synthesis include the elaboration of the polysubstituted decanoic acid parts by two asymmetric aldol reactions, assembly of the N-methyl-delta-hydroxyisoleucine residue by using either aza-Claisen rearrangement or methylation of aspartates as the key steps, and macrocyclization at the polysubstituted decanoic acid alanine site.
authors.affiliation: State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China.
authors.forename: Shouyun
authors.initials: S
authors.lastname: Yu
authors.forename: Xianhua
authors.initials: X
authors.lastname: Pan
authors.forename: Dawei
authors.initials: D
authors.lastname: Ma
mesh_terms: D000409:Alanine / Q000031:analogs & derivatives / Q000737:chemistry; D000596:Amino Acids / Q000138:chemical synthesis / Q000737:chemistry; D000818:Animals; D003652:Decanoic Acids / Q000737:chemistry; D047630:Depsipeptides / Q000138:chemical synthesis*; D007532:Isoleucine / Q000031:analogs & derivatives / Q000737:chemistry; D010456:Peptides, Cyclic / Q000138:chemical synthesis*; D011161:Porifera / Q000737:chemistry
chemical_list: D000596:Amino Acids; D003652:Decanoic Acids; D047630:Depsipeptides; D010456:Peptides, Cyclic; C444504:halipeptin A; C444503:halipeptin B; C513527:halipeptin C; C513526:halipeptin D; D007532:Isoleucine; C502516:(2S,3S,4R)-gamma-hydroxyisoleucine; D000409:Alanine