First example of regioselective nucleophilic 1,6-addition of trimethyl(trifluoromethyl)silane to 4H-chromene derivatives
作者:V. Ya. Sosnovskikh、B. I. Usachev、M. N. Permyakov、D. V. Sevenard、G.-V. Röschenthaler
DOI:10.1007/s11172-006-0475-9
日期:2006.9
Condensation of 2-trifluoromethylchromone with diethylmalonate, ethyl cyanoacetate, and Meldrum’s acid gave the corresponding methylidene derivatives of 2-trifluoromethyl-4H-chromene. Nucleophilic 1,6-addition of an excess of Me3SiCF3 in the presence of Me4NF to those obtained from the former two compounds afforded 4-substituted 2,2-bis(trifluoromethyl)-2H-chromenes.