Novel Synthesis of 2-(Trifluoromethyl)- and 2-(Perfluoroalkyl)-2-hydroxy-2<i>H</i>-chromenes and Their Regiospecific Reaction with Silyl Enol Ethers
作者:Salem El Kharrat、Philippe Laurent、Hubert Blancou
DOI:10.1021/jo060765a
日期:2006.10.1
of substituted 2-(trifluoromethyl)- and 2-(perfluoroalkyl)-2-hydroxy-2H-chromenes 2a−o was achieved in good yields by intramolecular cyclization of 3-(perfluoroalkyl)-3-phenoxypropenals 1 in the presence of aluminum chloride. Then a Lewis acid mediated nucleophilic reaction with silyl enol ethers 3 proceeded with complete regiospecificity to afford 4-functional 2-(trifluoromethyl)- and 2-(perfluor