1-Bromo-2-trifluoroacetylcyclobutenes as novel building blocks for the construction of trifluoromethyl substituted heterocycles. Part 1: Synthesis of 5-(trifluoromethyl)-2(5H)-furanones condensed with substituted cyclobutenes
作者:Andrey B. Koldobskii、Nikolay P. Tsvetkov、Ekaterina V. Solodova、Valery N. Kalinin
DOI:10.1016/j.jfluchem.2010.03.006
日期:2010.6
reduction of substituted 1-bromo-2-trifluoroacetylcyclobutenes by lithium aluminium hydride affords corresponding brominated alcohols, which, under the treatment of two equivalents of butyllithium, give new lithiated cyclobutenes. Their carboxylation followed by lactonization induced by trifluoroacetic anhydride appeared to be an effective approach towards 5-trifluoromethylated furanones condensed with substituted
用氢化铝锂对取代的1-溴-2-三氟乙酰基环丁烯进行区域选择性还原,得到相应的溴化醇,在两当量的丁基锂处理下,得到新的锂化的环丁烯。它们的羧化反应,然后由三氟乙酸酐诱导的内酯化作用,似乎是一种有效的方法,可以解决由取代的环丁烯环缩合的5-三氟甲基化呋喃酮的问题。