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 conjugateaddition 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 trimethylsilylchloride (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