A synthesis of a novel electrophilic reagent 1,1,1-trifluoro-4-(phenylsulfonyl)-but-3-ene-2,2-diol 2 is described. The reaction of 2 with various electron-rich heteroaromatics such as furans, pyrroles, indoles is investigated. The addition-elimination reaction proceeds under mild conditions stereospecifically and permits a novel one-step procedure for the preparation of trifluoroacetylvinyl substituted heterocycles in high yield. In all cases only E-isomers of unsaturated CF3 ketones were obtained.
本文介绍了一种新型亲电试剂 1,1,1-三
氟-4-(苯磺酰基)-丁-3-烯-2,2
-二醇 2 的合成。研究了 2 与各种富电子杂
芳烃(如
呋喃、
吡咯、
吲哚)的反应。加成-消除反应在温和的条件下立体定向地进行,并允许采用一种新颖的一步法高产率制备三
氟乙酰乙烯基取代的杂环。在所有情况下,只得到了不饱和
CF3 酮的 E 异构体。