title: Synthesis of 1,3-dithianes and 1,3-dithiolanes. Baker's yeast reduction and lipase-catalyzed resolution for synthesis of enantiopure derivatives.
abstract: Three 1,3-dithiolanes and four 1,3-dithianes have been synthesised from 1-(1,3-dithiolan-2-yl)-2-propanone and 1-(1,3-dithian-2-yl)-2-propanone, respectively. Asymmetric reductions of these ketones using baker's yeast gave the corresponding enantiopure (S)-alcohols. Baker's yeast also reduced the double bond in 3-(1,3-dithian-2-yl)-3-buten-2-one enantioselectively to give (S)-3-(1,3-dithian-2-yl)-2-butanone. 3-(1,3-Dithian-2-yl)-3-buten-2-one was also reduced chemo-selectively and the resulting 3-(1,3-dithian-2-yl)-3-buten-2-ol was resolved by transesterification in organic solvent using lipase B from Candida antarctica to yield the (S)-alcohol and the (R)-acetate with very high enantiomeric ratio, E. Racemic 1-(1,3-dithiolan-2-yl)-2-propanol and 1-(1,3-dithian-2-yl)-2-propanol were also resolved under similar conditions to give the (S)-alcohols and the corresponding (R)-acetates.
authors.affiliation: Department of Chemistry, Norwegian University of Science and Technology, Trondheim, Norway.
authors.forename: T
authors.initials: T
authors.lastname: Anthonsen
authors.forename: B H
authors.initials: BH
authors.lastname: Hoff
authors.forename: N U
authors.initials: NU
authors.lastname: Hofsløkken
authors.forename: L
authors.initials: L
authors.lastname: Skattebøl
authors.forename: E
authors.initials: E
authors.lastname: Sundby
mesh_terms: D004800:Enzymes, Immobilized; D006573:Heterocyclic Compounds, 1-Ring / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D007202:Indicators and Reagents; D008049:Lipase / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D010084:Oxidation-Reduction; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000201:enzymology; D013237:Stereoisomerism; D013457:Sulfur Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology
chemical_list: D004800:Enzymes, Immobilized; D006573:Heterocyclic Compounds, 1-Ring; D007202:Indicators and Reagents; D013457:Sulfur Compounds; D008049:Lipase