Novel Bifunctionalization of Activated Methylene: Base‐Promoted Trifluoromethylthiolation of β‐Diketones with Trifluoromethanesulfinyl Chloride
作者:Dong‐Wei Sun、Min Jiang、Jin‐Tao Liu
DOI:10.1002/chem.201901781
日期:2019.8.14
β-diketones or β-ketoesters with trifluoromethanesulfinyl chloride. A series of α-trifluoromethylthiolated α-chloro-β-diketones and α-chloro-β-ketoesters were obtained in moderate to good yields under mild conditions. When β-diketones containing a phenyl group with a hydroxyl or amino substituent at the ortho position were used as substrates, intramolecular trifluoromethylthiolation/cyclization reaction took
通过用三氟甲亚磺酰氯将β-二酮或β-酮酸酯进行碱促进的三氟甲基硫醇化,成功实现了活化亚甲基的新型双功能化。在温和条件下,以中等至良好的收率获得了一系列α-三氟甲基硫醇化的α-氯代-β-二酮和α-氯代-β-酮酸酯。当使用在邻位上具有羟基或氨基取代基的苯基的β-二酮作为底物时,发生分子内三氟甲基硫醇化/环化反应,得到相应的环状产物。此外,该方案可以扩展到全氟烷基亚磺酸钠/ POCl3系统的全氟烷基硫醇化。根据实验结果,提出了合理的机制。