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Diastereoselectivity Enhancement in Cyclopropanation and Cyclopropenation Reactions of Chiral Diazoacetate Esters Catalyzed by Chiral Dirhodium(II) Carboxamides
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1993
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Diastereoselectivity EnhancementChemical EngineeringEngineeringChiral AuxiliariesChiral Diazoacetate EstersHeterocyclicChiral DirhodiumOrganic ChemistryCatalysisStereoselective SynthesisChemistryAsymmetric CatalysisEnantioselective SynthesisBiomolecular EngineeringCyclopropenation Reactions
The extent of stereodifferentiation in intermolecular cyclopropanation and cyclopropenation reactions has been determined with chiral diazoacetate esters possessing chiral auxiliaries derived from d- and l-menthol, (+)-trans-2-phenylcyclohexanol, and (-)-D-pantolactone, catalyzed by chiral dirhodium(II) tetrakis(methyl 2-pyrrolidone-5-carboxylates).