ZnCl<sub>2</sub>-catalyzed chemoselective cascade reactions of enaminones with 2-furylcarbinols: a versatile process for the synthesis of cyclopenta[b]pyrrole derivatives
作者:Chengyu Wang、Chunyi Dong、Lingkai Kong、Yanli Li、Yanzhong Li
DOI:10.1039/c3cc49191a
日期:——
A ZnCl2-catalyzed cascade reaction of enaminones with 2-furylcarbinols offers a chemo- and diastereo-selective access to functionalized cyclopenta[b]pyrrole derivatives.
synthetic strategy to functionalize the indole nucleus with readily available 2-furylcarbinols was developed. It was found that the 3-(4-oxo-2-cyclopentenyl)indoles were obtained in moderate to good yields (up to 89%) through Piancatelli reaction catalyzed by ZnCl2, whereas employment of Brønsted acid TFA afforded directly coupled product 3-(2-furyl)indoles in moderate to good yields (up to 87%) via
AlCl<sub>3</sub>-catalyzed chemoselective cascade reactions of 4-anilinocoumarins with 2-furylcarbinols: access to densely functionalized chromeno[4,3-<i>b</i>]pyrrol-4(1<i>H</i>)-one derivatives
作者:Pengcheng Guan、Rong Ma、Minghui Liu、Lingkai Kong、Yu Han、Chengyu Wang
DOI:10.1039/d2ob02248f
日期:——
developed for the preparation of highly functionalized chromeno[4,3-b]pyrrol-4(1H)-ones, which are not only valuable architectures of many biologically active molecules but also key building blocks for rich photophysical properties. The transformation proceeded through chemoselective intermolecular α-carbon nucleophilic attacking/ring-opening/Michael addition/deprotonation aromatization processes from
已经开发出一种前所未有的方案来制备高度功能化的 chromeno[4,3- b ]pyrrol-4(1 H )-ones,它们不仅是许多生物活性分子的宝贵结构,而且还是丰富光物理特性的关键构建块. 该转化通过 4-氨基香豆素和 2-呋喃基甲醇的化学选择性分子间 α-碳亲核攻击/开环/迈克尔加成/去质子芳构化过程进行。
Lewis Acid Catalyzed Regiospecific Cross-Dehydrative Coupling Reaction of 2-Furylcarbinols with β-Keto Amides or 4-Hydroxycoumarins: A Route to Furyl Enols
Lewis acid-catalyzed directly dehydrative carbon-carbon bond formation reaction of 2-furylcarbinols with beta-keto amides provides a straight method for regioselective synthesis of (Z)-furyl-enols. Moreover, this Lewis acid-catalyzed cross-coupling reaction can be extended to an interesting heterocyclic version, featuring a functionalized 3-furyl-4-hydroxycoumarins synthesis.