A Remarkable Influence of a Trifluoromethyl Group on the Reactions of β-Mercaptoalcohols with Fluorinated α-Bromoenones
作者:Emilia Obijalska、Maria Pawelec、Grzegorz Mlostoń、Antonella Capperucci、Damiano Tanini、Heinz Heimgartner
DOI:10.1002/ejoc.201701752
日期:2018.8.1
Isomeric fluorinated α‐bromoenones react with dinucleophilic β‐mercaptoalcohols in CH2Cl2 at room temperature in the presence of Et3N in a multistep process. Depending on the position of the CF3 group, different O,S‐heterocycles or non‐cyclic products were obtained. With 3‐bromo‐1,1,1‐trifluorobut‐3‐en‐2‐ones derivatives of 1,4‐oxathianes were formed, but isomeric 2‐bromo‐4,4,4‐trifluorobut‐2‐en‐1‐ones
在室温下,在 Et3N 存在下,异构氟化 α-溴烯酮在 CH2Cl2 中与双亲核 β-巯基醇在多步过程中反应。根据 CF3 基团的位置,得到不同的 O,S-杂环或非环状产物。与 3-bromo-1,1,1-trifluorobut-3-en-2-ones 形成 1,4-oxathianes 的衍生物,但异构体 2-bromo-4,4,4-trifluorobut-2-en-1-生成 1,3-氧杂硫杂环戊烷或非环状硫化物。硫杂-迈克尔加成被提议作为反应的初始步骤,最终的杂环化由 CF3 基团的位置控制。