oxidant. In the presence of Mn(OAc)3, indole-2, and indole-3-carbonyl compounds were alkylated at the 3- and 2- positions, respectively, with subsequent oxidation and nucleophilic capture occurring at the newly formed benzylic carbon. In contrast, oxidation of 2- and 3-indole carboxylic acids afforded the corresponding 2-oxindol-3-ylidenes and 3-oxindol-2-ylidenes. The reaction conditions, scope, and mechanism
使用
乙酸锰(III)作为氧化剂进行
吲哚/
吡咯,
丙二酸二甲酯和
乙酸的一锅三组分偶联反应。在Mn(OAc)3存在下,
吲哚-2和
吲哚-3-羰基化合物分别在3-和2-位烷基化,随后在新形成的苄基碳上发生氧化和亲核捕获。相反,2-和3-
吲哚羧酸的氧化提供了相应的2-oxindol-3-亚烷基和3-oxindol-2-亚烷基。反应条件,范围和机理在本文中讨论。