Trifluoromethylation and pentafluoroethylation of terpenoid carbonyl compounds used in perfumery
摘要:
The reaction of trifluoromethyltrimethylsilane with a variety of terpenoid carbonyl compounds and other carbonyl compounds used in perfumery gave the corresponding trifiuoromethylated derivatives. Pentafluoroethylated compounds were similarly obtained from the reaction of pentafluoroethyltrimethylsilane with various substrates. (-)-2-Trifluoro-1-furyl ethanol has been obtained with high optical purity by enzymatic hydrolysis of 2-trifluoro-1-furyl ethyl acetate.
The protocol of micro-flow nucleophilic pentafluoroethylation using pentafluoroethane (HC2F5, HFC-125), a nontoxic, inexpensive, and commercially available greenhouse gas, is described. The micro-flow pentafluoroethylation by HFC-125 proceeded smoothly at room temperature or at −10 °C in DMF or toluene in the presence of a potassium base, namely, t-BuOK or KHMDS. A broad range of ketones, aldehydes