title: Enantioselective synthesis of schulzeines B and C via a beta-lactone-derived surrogate for bishomoserine aldehyde.
abstract: Enantioselective syntheses of the glucosidase inhibitors schulzeines B and C were achieved by employing a Pictet-Spengler reaction of a beta-lactone-derived, masked bishomoserine aldehyde. Subsequent Corey-Link reaction unveiled an alpha-azido acid enabling cyclization to the delta-lactam fused tetrahydroisoquinoline. An efficient synthesis of the trisulfate-bearing side chain featured a Noyori hydrogenation and a Sharpless dihydroxylation. An unexpected reaction of a pendant amine during a Corey-Link process opens avenues for the synthesis of proline and related amino acid derivatives.
authors.affiliation: Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Daniel
authors.initials: D
authors.lastname: Romo
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D001688:Biological Products / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D065089:Glycoside Hydrolase Inhibitors; D006575:Heterocyclic Compounds, 3-Ring / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D007769:Lactams / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D007783:Lactones / Q000737:chemistry*; D015394:Molecular Structure; D013237:Stereoisomerism
chemical_list: D000447:Aldehydes; D001688:Biological Products; D065089:Glycoside Hydrolase Inhibitors; D006575:Heterocyclic Compounds, 3-Ring; D007769:Lactams; D007783:Lactones; C523671:schulzeine B; C523672:schulzeine C