The first practical synthesis of isoxazole triflones 3 (4-trifluoromethanesulfonylisoxazoles, 4-triflylisoxazoles) has been achieved by an operationally simple procedure consisting of the reaction between readily available α-triflyl ketones 4 and imidoyl chlorides 5 in the presence of triethylamine. The present method provides the biologically attractive isoxazoles featuring a triflyl group at the
Highly efficient synthesis of tetrasubstituted 2,3-dihydropyrans by three-component ‘one-pot’ reaction
作者:Chao Li、Liang-Zhen Cai、Xiao-Dong Liu、Shi-Zheng Zhu、Chun-Hui Xing、Long Lu
DOI:10.1016/j.tetlet.2016.04.008
日期:2016.5
With ammonium acetate as catalyst, three-component ‘one-pot’ reaction of β-keto perfluoroalkanesulfones, aldehydes, and vinyl ethers proceeded smoothly and afforded tetrasubstituted 2,3-dihydropyrans in moderate to excellent yields. Both aromatic and aliphatic aldehydes, as well as cyclic vinyl ether are compatible with this methodology. All dihydropyran products were obtained as cis- and trans-diastereomeric
A series of stable fluorine-containing arsonium ylides and sulfur ylides were simply synthesized from perfluoroalkanesulfonyl diazocarbonyl compounds in the presence of rhodium catalyst. The ylide products are fairly stable due to the strong electron-withdrawing properties of perfluoroalkanesulfonyl group and carbonyl group. They are fully confirmed by spectral methods and the structures of 3ba and