Manganese(III) Acetate-mediated Alkylation of 1,3-Dicarbonyls to Form Tricarbonyl Compounds Bearing a Quaternary Carbon Centre
作者:Gregory Bar、Andrew F. Parsons、C. Barry Thomas
DOI:10.1055/s-2002-32576
日期:——
1,3-Dicarbonyl compounds including ethyl 2-methylacetoacetate can be efficiently alkylated with enol ethers or enolesters in the presence of manganese(III) acetate. These intermolecular radical addition reactions can be used to form sterically congested quaternary carbon centres in excellent yield (81-97%).
Manganese(iii) acetate-mediated alkylation of β-keto esters and β-keto amides: an enantio- and diastereo-selective approach to substituted pyrrolidinones
作者:Gregory Bar、Andrew F. Parsons、C. Barry Thomas
DOI:10.1039/b209123b
日期:2003.1.13
beta-Keto esters and beta-keto amides can be efficiently alkylated on reaction with enol ethers and manganese(III) acetate in the presence of copper(II) acetate. These intermolecular radical addition reactions can be used to construct quaternary carbon centres in excellent yield and this method has been utilised in a diastereoselective approach to substituted pyrrolidinones.
Use of the Composite Material RuO<sub>2</sub>/BaTi<sub>4</sub>O<sub>9</sub> as an Environmentally Benign Solid Catalyst for the Oxidative Cleavage of Olefins
Catalytic use of a composite material, RuO2/BaTi4O9, in combination with NaIO4 in EtOAc-H2O has been shown to efficiently cleave alkenes, affording ketones, aldehydes and/or carboxylic acids in high yields.