Fenton reagent-catalyzed trifluoromethylation of enamines of 3-oxocarboxylates with CF3I
作者:Yuhki Ohtsuka、Daisuke Uraguchi、Kyoko Yamamoto、Kenji Tokuhisa、Tetsu Yamakawa
DOI:10.1016/j.jfluchem.2015.10.013
日期:2016.1
The trifluoromethylation of enamines of ethyl 3-oxocarboxylates catalyzed by Fenton reagent with CF3I was investigated. Trifluoromethylation followed by acid hydrolysis provided 3-oxo-2-(trifluoromethyl)carboxylates in 64–94% yields, which were greater than those obtained by the trifluoromethylation of 3-oxocarboxylates as reported previously. Enamines trifluoromethylated at the 2-position were isolated
研究了Fenton试剂与CF 3 I催化3-氧代羧酸乙酯的烯胺的三氟甲基化。三氟甲基化再进行酸水解后,可得到64-94%的3-氧代-2-(三氟甲基)羧酸酯,这比先前报道的3-氧代羧酸酯的三氟甲基化所得到的产率更高。分离2-位三氟甲基化的烯胺作为中间体。所获得的3-氧代-2-(三氟甲基)羧酸酯的水解和连续脱羧在酸性条件下以令人满意的产率提供了(2,2,2-三氟乙基)酮。