Perfluoroalkylations of Carbanions with (Perfluoroalkyl)phenyliodonium Triflates (FITS Reagents)
作者:Teruo Umemoto、Yoshihiko Gotoh
DOI:10.1246/bcsj.59.439
日期:1986.2
smoothly with enolate anions of active methylene compounds such as 2-methyl-1,3-cyclopentanedione, ethyl 2-methylacetoacetate, and ethyl 2-oxocyclopentanecarboxylate in a polar solvent to afford O- and C-perfluoroalkylation products in moderate yields, ratios O-/C-Rf products depending on the reaction temperature. Anions of diethyl 2-methylmalonate and 2-nitropropane afforded C-Rf-compounds only.
FITS 试剂在-78 °C 的 THF 中与伯烷基卤化镁反应,以中等至良好的产率得到相应的全氟烷基 (Rf)-烷烃。但是烷基锂或铜的 Rf 产物产率很低。FITS 与仲或叔烷基卤化镁的反应导致产物收率低。炔基-锂或卤化镁以有利的产率产生Rf-炔烃。与芳基或乙烯基卤化镁的反应复杂且Rf衍生物的产率低。FITS 还与活性亚甲基化合物(如 2-甲基-1,3-环戊二酮、2-甲基乙酰乙酸乙酯和 2-氧代环戊烷羧酸乙酯)的烯醇阴离子在极性溶剂中顺利反应,以中等产率得到 O-和 C-全氟烷基化产物, O-/C-Rf 产物的比率取决于反应温度。