Cu-Catalyzed Conjugate Addition of Grignard Reagents to Thiochromones: An Enantioselective Pathway for Accessing 2-Alkylthiochromanones
作者:Qingxiong Yang、Jun Wang、Shihui Luo、Ling Meng
DOI:10.1055/s-0037-1610225
日期:2018.9
The enantioselective incorporation of alkyl groups in thiochromones was realized for the first time by a Cu/(R,S)-PPF-P t Bu2-catalyzed conjugate addition of Grignardreagents to thiochromones. With this method, a series of 2-methylthiochromanones were obtained in good yields (up to 96% yield) with moderate-to-good ee values (up to 87% ee). The established method expedites the synthesis of a large
通过Cu/(R,S)-PPF-P t Bu2 催化的格氏试剂与硫色酮的共轭加成,首次实现了烷基在硫色酮中的对映选择性掺入。使用这种方法,以良好的收率(最高 96% 的收率)获得了一系列 2-甲基硫代色满酮,其 ee 值中等至良好(最高 87% ee)。已建立的方法加速了大型手性硫代色满酮库的合成,以用于进一步的合成应用和生物学研究。
Synthesis of benzothiazonine by rhodium-catalyzed denitrogenative transannulation of 1-sulfonyl-1,2,3-triazole and thiochromone
作者:Saygbechi T. Jablasone、Zihang Ye、Shengguo Duan、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1039/d1ob00419k
日期:——
A facile synthesis of functionalized benzothiazonine was achieved by rhodium-catalyzed denitrogenative annulation of easily available 1-sulfonyl-1,2,3-triazole and thiochromone.
Development of Conjugate Addition of Lithium Dialkylcuprates to Thiochromones: Synthesis of 2-Alkylthiochroman-4-ones and Additional Synthetic Applications
Lithium dialkylcuprates undergo conjugateaddition to thiochromones to afford 2-alkylthiochroman-4-ones in good yields. This approach provide an efficient and general synthetic approach to privileged sulfur-containing structural motifs and valuable precursors for many pharmaceuticals, starting from common substrates-thiochromones. Good yields of 2-alkyl-substituted thiochroman-4-ones are attained with
Palladium-Catalyzed Synthesis of (<i>Z</i>)-3-Arylthioacrylic Acids and Thiochromenones
作者:Thiruvengadam Palani、Kyungho Park、Kwang Ho Song、Sunwoo Lee
DOI:10.1002/adsc.201201106
日期:2013.4.15
reaction of aryl halides, sodium sulfide pentahydrate (Na2S⋅5 H2O), and propiolic acid in the presence of 2.5% bis(triphenylphosphine)palladium chloride [Pd(PPh3)2Cl2], 5% 1,4‐bis(diphenylphosphino)butane (dppb) and 2 equivalents of 1,8‐diazabicycloundec‐7‐ene (DBU) produces stereoselectively (Z)‐3‐arylthioacrylic acids in good yields. A study of the reaction pathway suggested that the CS bond formation
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