α-Trifluoromethyl Carbanion-catalyzed Intermolecular Stetter Reaction of Aromatic Aldehydes with 2-Bromo-3,3,3-trifluoropropene: Synthesis of β-Alkoxyl-β-trifluoromethylated Ketones
作者:Yingying Cai、Huanfeng Jiang、Chuanle Zhu
DOI:10.1021/acs.orglett.1c03553
日期:2022.1.14
intermolecular Stetter reaction of aromatic aldehydes with 2-bromo-3,3,3-trifluoropropene is achieved by the in situ generated α-trifluoromethyl carbanion catalyst. It not only represents the first example for α-trifluoromethyl carbanion-catalyzed umpolung reaction but also reveals a new protocol for the umpolung of aldehydes. Various useful β-alkoxyl-β-trifluoromethylated ketones were obtained in high yields
芳香醛与2-溴-3,3,3-三氟丙烯的分子间Stetter反应是通过原位生成的α-三氟甲基碳负离子催化剂实现的。它不仅代表了 α-三氟甲基碳负离子催化的 umpolung 反应的第一个例子,而且还揭示了醛的 umpolung 的新方案。以高产率获得了各种有用的β-烷氧基-β-三氟甲基化酮,可进一步转化为有吸引力的生物活性化合物。机理研究表明,该反应涉及氢原子的分子内 1,4 位移。