title: Regioselective nucleophilic addition to carbonyl ylide intermediates: a novel diastereoselective synthesis of cycloalkyl fused furan-3-ones.
abstract: [structures: see text] A range of cis-fused hexahydro-1-benzofuran-3(2H)-one or tetrahydro-2H-cyclopenta[b]furan-3(3aH)-one ring systems was synthesized by the rhodium(II) acetate catalyzed reaction of alpha-diazo carbonyl compounds in the presence of various oxygen, nitrogen, and sulfur nucleophiles. A double-nucleophilic addition was possible by using an excess of alpha-diazo ketone. These reactions proceeded with complete diastereoselectivity, and the stereochemistry was confirmed by the single-crystal X-ray analysis. This process discloses the first example of tandem cyclization-nucleophilic addition reaction.
authors.affiliation: Central Salt & Marine Chemicals Research Institute (CSIR), Bhavnagar, Gujarat-364 002, India. muthu@csmcri.org
authors.forename: Sengodagounder
authors.initials: S
authors.lastname: Muthusamy
authors.forename: Boopathy
authors.initials: B
authors.lastname: Gnanaprakasam
authors.forename: Eringathodi
authors.initials: E
authors.lastname: Suresh
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001643:Bridged Bicyclo Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D003516:Cycloparaffins / Q000138:chemical synthesis* / Q000737:chemistry; D005663:Furans / Q000138:chemical synthesis* / Q000737:chemistry; D007659:Ketones / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D013237:Stereoisomerism
chemical_list: D001391:Azo Compounds; D001643:Bridged Bicyclo Compounds; D003516:Cycloparaffins; D005663:Furans; D007659:Ketones