Iodine-Mediated Oxidative Cyclization of 2-(Pyridin-2-yl)acetate Derivatives with Alkynes: Condition-Controlled Selective Synthesis of Multisubstituted Indolizines
作者:Lisheng He、Yuzhu Yang、Xiaolan Liu、Guangyan Liang、Chunyan Li、Daoping Wang、Weidong Pan
DOI:10.1055/s-0039-1690229
日期:2020.2
An iodine-mediated oxidative cyclization reaction between 2-(pyridin-2-yl)acetate derivatives and different alkynes has been developed, which provides regioselective and chemoselective syntheses of multiply substituted indolizines under modified reaction conditions. Plausible mechanisms have been proposed to explain the selective syntheses of indolizines. This protocol can be also applied to the stepwise
catalyzed synthesis of indolizine-1-carboxylates through oxidative CC and CN bondformations by the reaction of 2-pyridyl acetates with alkynes and alkenes without metal, oxidant, and base. This procedure is compatible with a broad range of functional groups in both alkynes and alkenes with good yields. The reaction proceeds through a tandem CC bondformation followed by an intramolecular cyclization
A novel copper/I2-mediated oxidative cross-coupling/cyclization of 2-(pyridin-2-yl)acetate derivatives and simple olefins is developed, which provides a straightforward and efficient access to structural diversely indolizines. A series of 1,3-di- and 1,2,3-trisubstituted indolizines are easily synthesized in modest to excellent yields.
开发了新颖的铜/ I 2介导的2-(吡啶-2-基)乙酸酯衍生物和简单烯烃的氧化交叉偶联/环化,其提供了直接且有效地获得结构多样的吲哚嗪的途径。一系列1,3-二-和1,2,3-三取代的吲哚嗪很容易合成,收率适中至优异。