Synthetic Approach to Alkoxy-β-(trifluoromethyl)styrenes and Their Application in the Synthesis of New Trifluoromethylated Heterocycles
作者:Valentine Nenajdenko、Günter Haufe、Vasiliy Muzalevskiy、Aleksey Shastin、Elizabeth Balenkova
DOI:10.1055/s-0029-1216697
日期:2009.7
A new convenient stereoselective pathway to alkoxy-β-(trifluoromethyl)styrenes is described. Reactions of β-chloro- and β-bromo-β-(trifluoromethyl)styrenes with sodium methoxide and potassium tert-butoxide led to methoxy- and tert-butoxy-β-(trifluoromethyl)styrenes in good to excellent yields. Bromination of tert-butoxy-β-(trifluoromethyl)styrenes proceeded with formation of aryl(bromo)methyl trifluoromethyl
描述了一种新的方便的烷氧基-β-(三氟甲基)苯乙烯的立体选择途径。β-氯-和β-溴-β-(三氟甲基)苯乙烯与甲醇钠和叔丁醇钾的反应生成甲氧基-和叔丁氧基-β-(三氟甲基)苯乙烯,收率好至优异。叔丁氧基-β-(三氟甲基)苯乙烯的溴化反应形成芳基(溴)甲基三氟甲基酮。发现后一种化合物是用于合成带有三氟甲基的不同杂环化合物的有用起始原料。以这种方式,以中等至高产率获得了咪唑并吡啶,咪唑并嘧啶,咪唑并苯并咪唑,咪唑并噻唑,噻唑和氨基噻唑的三氟甲基化衍生物。 烯烃-炔烃-醚-氟-杂环-亲核取代