Iridium-Catalyzed Branch-Selective Hydroalkylation of Simple Alkenes with Malonic Amides and Malonic Esters
作者:Takahiro Sawano、Masaki Ono、Ami Iwasa、Masaya Hayase、Juri Funatsuki、Ayumu Sugiyama、Eri Ishikawa、Takeshi Yoshikawa、Ken Sakata、Ryo Takeuchi
DOI:10.1021/acs.joc.2c02599
日期:2023.2.3
malonic amides and malonic esters under neutral reaction conditions. A variety of aliphatic alkenes and aromatic alkenes bearing bromine, chlorine, ester, 2-thienylcarboxylate, silyl, and phthalimide groups were all found to be suitable for this hydroalkylation. The combination of this method with Krapcho dealkoxycarbonylation realized a one-pot synthesis of β-substituted amide and ester from β-amide
我们报道了在中性反应条件下,铱催化的简单烯烃如脂肪族烯烃和芳香族烯烃与丙二酰胺和丙二酸酯的支链选择性加氢烷基化反应。各种带有溴、氯、酯、2-噻吩基羧酸酯、甲硅烷基和邻苯二甲酰亚胺基团的脂肪族烯烃和芳香族烯烃都被发现适用于这种加氢烷基化反应。该方法与Krapcho脱烷氧基羰基化相结合,实现了β-酰胺酯和丙二酸酯一锅法合成β-取代酰胺和酯。衍生自丙二酰胺的加氢烷基化产物适合进一步转化。微调的反应条件实现了使用相同试剂将加氢烷基化产物选择性转化为 1,3-二胺或单酰胺。氘标记实验和动力学同位素效应的测量表明,催化循环涉及可逆步骤,C-H 键的裂解不是决速步骤。密度泛函理论计算提供了对反应机制的深入了解,其中碳化步骤之后是 C-H 还原消除。