Tsuji–Trost reaction of 4,4,4-trifluorobut-2-en-1-yl acetate and ethyl(4,4,4-trifluorobut-2-en-1-yl)carbonate was accomplished with various nucleophiles including phenols, amines, and malonates. In the case of the phenols, isomerization of the double bond in the product (up to 20%) was observed as a side reaction. Further synthetic transformations including hydrogenation, the Diels–Alder reaction, and asymmetric
phenols, aliphatic and aromaticamines, aliphatic and aromatic thiols and malonates. Overall, the two approaches were found to be complementary as the Tsuji–Trost reaction worked better with phenols while the SN2 reaction generally provided better results with the amines. In addition, the sulfur-based product could only be obtained using the SN2 reaction while the malonates only worked under the Tsuji–Trost
can reductively desymmetrize a large collection of easily available halomalonic esters to α-halo-β-hydroxyesters. These polyfunctionalized tertiary alkyl fluorides, chlorides, and bromides proved to be useful intermediates toward fluorinated drug analogs and polyhalogenated monoterpenes. The facile intramolecularepoxidation of the chiral chloride and bromide products has also enabled expeditious access
α-Hydroxylation of 1,3-Dicarbonyl Compounds Catalyzed by Polymer-incarcerated Gold Nanoclusters with Molecular Oxygen
作者:Hiroyuki Miyamura、Shū Kobayashi
DOI:10.1246/cl.2012.976
日期:2012.9.5
α-Hydroxylation of 1,3-dicarbonyl compounds was successfully catalyzed by carbon-stabilized polymer-incarcerated gold nanoclusters (PI/CB-Au). The reaction proceeded under mild conditions using mol...