Sustainable Manganese-Catalyzed Solvent-Free Synthesis of Pyrroles from 1,4-Diols and Primary Amines
作者:Jannik C. Borghs、Yury Lebedev、Magnus Rueping、Osama El-Sepelgy
DOI:10.1021/acs.orglett.8b03506
日期:2019.1.4
A general and selective metal-catalyzed conversion of biomass-derived primary diols and amines to the highly valuable 2,5-unsubstituted pyrroles has been developed. The reaction is catalyzed by a stable nonprecious manganese complex (1 mol %) in the absence of organic solvents whereby water and molecular hydrogen are the only side products. The manganese catalyst shows unprecedented selectivity, avoiding
AN EFFICIENT AND RAPID SYNTHESIS OF N-SUBSTITUTED PYRROLES BY MICROWAVE ASSISTED SOLID ACID CATALYSIS
作者:Mohammed Abid、Shainaz M. Landge、Béla Török
DOI:10.1080/00304940609356444
日期:2006.10
total synthesis of these compounds .' Accordingly, extended efforts have been made toward the synthesis of wide range of pyrrole derivatives. Most of these methods involve various cyclocondensations reactions resulting in 254or polysubstituted pyrroles.2 However, the environmentally benign synthesis of N-monosubstituted pyrroles is still a challenge. The commonly used traditional P205 catalysis has disadvantages
sustainable, highly regiospecific substituted pyrroles were synthesized using a well-defined, air stable, molecular iron(0) complex. The developed methodology is broadly applicable and tolerates a variety of functional groups. C-2, C-3, and C-2 & C-4 substituted pyrroles were synthesized in good yield. Symmetrical bis-pyrroles were accessible for the first time using an ironcatalyst. On the basis of the experimental
An operationally simple catalyst-free protocol for the direct regiospecificsynthesis of β-(C3)-substituted pyrroles has been developed. The enamine intermediate, in situ generated from succinaldehyde and a primary amine, was trapped with activated carbonyls before the Paal–Knorr reaction in a direct multicomponent “just-mix” fashion to furnish pyrroles with overall good yields. Several C3-substituted