Conjugate Addition of Grignard Reagents to Thiochromones Catalyzed by Copper Salts: A Unified Approach to Both 2-Alkylthiochroman-4-One and Thioflavanone
作者:Tania J. Bellinger、Teavian Harvin、Ti’Bran Pickens-Flynn、Nataleigh Austin、Samuel H. Whitaker、Mai Ling C. Tang Yuk Tutein、Dabria T. Hukins、Nichele Deese、Fenghai Guo
DOI:10.3390/molecules25092128
日期:——
Grignard reagents undergo conjugate addition to thiochromones catalyzed by copper salts to afford 2-substituted-thiochroman-4-ones, both 2-alkylthiochroman-4-ones and thioflavanones (2-arylthiochroman-4-ones), in good yields with trimethylsilyl chloride (TMSCl) as an additive. The best yields of 1,4-adducts can be attained with CuCN∙2LiCl as the copper source. Excellent yields of 2-alkyl-substituted thiochroman-4-ones
格氏试剂与由铜盐催化的硫代色满酮发生共轭加成,得到 2-取代的 thiochroman-4-ones,包括 2-alkalthiochroman-4-ones 和 thioflavanones(2-arylthiochroman-4-ones),与三甲基氯硅烷以良好的收率( TMSCl) 作为添加剂。以 CuCN∙2LiCl 作为铜源可获得 1,4-加合物的最佳产率。使用范围广泛的格氏试剂可获得 2-烷基取代的 thiochroman-4-ones 和硫代黄烷酮(2-芳基取代)的优异产率。这种方法适用于烷基和芳香格氏试剂,从而为特权 2-取代的 thiochroman-4-ones 提供了统一的合成方法,并为许多药物活性分子的进一步合成应用提供了潜在的有价值的前体。