The design and development of an enantioselective aza-Piancatelli rearrangement reaction are described. In the presence of a chiral phosphoric acid catalyst, furylcarbinols react with anilines to afford highly functionalized cyclopentenones with excellent diastereo- and enantioselectivities. The process was shown to be scalable, and up to 1 gram of starting material could be employed under mild reaction
A new synthesis of 5-methylene-2(5H)-furanone derivatives
作者:Roberto Antonioletti、Maurizio D'Auria、Antonella De Mico、Giovanni Piancatelli、Arrigo Scettri
DOI:10.1016/s0040-4020(01)88810-4
日期:1984.1
5-methylene-2(5H)-furanonederivatives are easily obtained by treatment of tertiary 2-furylcarbinols with pyridinium dichromate in dimethylformamide solution. Through this procedure, a natural product, the thiophene lactone isolated from Chamaemelum Nobile L., has been synthesized.
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。
ANTONIOLETTI, R.;DAURIA, M.;DE, MICO, A.;PIANCATELLI, G.;SCETTRI, A., TETRAHEDRON, 1984, 40, N 19, 3805-3808
作者:ANTONIOLETTI, R.、DAURIA, M.、DE, MICO, A.、PIANCATELLI, G.、SCETTRI, A.