Catalytic Deprotonative Functionalization of Propargyl Silyl Ethers with Imines
作者:Hiroshi Naka、Daiki Koseki、Yoshinori Kondo
DOI:10.1002/adsc.200800281
日期:2008.8.4
A metal-free, catalytic CH functionalization of propargylsilylethers with imines using the phosphazene base (t-Bu-P4 base) provides structurally defined multisubstituted pyrroles in modest to excellent yields under mild conditions. A one-pot, three-component reaction using silylated acetylenes, aldehydes, and imines is also presented.
The Paal–Knorr reaction revisited. A catalyst and solvent-free synthesis of underivatized and N-substituted pyrroles
作者:Hyejin Cho、Richard Madden、Bilal Nisanci、Béla Török
DOI:10.1039/c4gc01523a
日期:——
A catalyst and solvent-free room temperature synthesis of pyrroles is described.
描述了一种无催化剂和溶剂的室温合成吡咯的方法。
Synthesis of Tetrasubstituted Pyrroles from Terminal Alkynes and Imines
作者:Yancheng Hu、Chunxiang Wang、Dongping Wang、Fan Wu、Boshun Wan
DOI:10.1021/ol401369d
日期:2013.6.21
Tetrasubstituted pyrroles can be obtained via the reaction of terminal alkynes and Imines using (BuLi)-Bu-n as the base In one step with high chemoselectivity (method 1). Alternatively, the intermediate propargylamines can also react with imines to afford tetrasubstituted pyrroles when using LiHMDS as the base (method 2), which provides a complementary method to construct the pyrroles with different substituents.
A convenient approach for the synthesis of substituted pyrroles by using phosphoric acid as a catalyst and their photophysical properties
作者:Yusuf Ajibola Ibrahim、Jiahui Li、Liankun Ai、Baolin Li
DOI:10.1016/j.molstruc.2021.132123
日期:2022.3
pyrrole compounds aside from six knowns, including the synthetically challenging tetra- and penta-substituted pyrroles from the corresponding 1,4-dicarbonyl through Paal-Knorr synthesis in the presence of 5% phosphoric acid as the catalyst. Our method is noteworthy for cheap catalyst, uncomplicated experimental setup under air atmosphere, scalability, and excellent yields. The fluorescence of some