A short synthesis of N-substituted 3,4-diarylpyrroles by condensation of a phenacyl halide with a primary amine and a phenylacetaldehyde is reported. The key step is an intramolecular cyclization of an in situ generated enamine onto a ketone. Using differently substituted aromatic reactants and N-(3-aminopropyl)azatricyclodecane as the amine component, the preparation of analogs of the cytotoxic marine
A simple and efficient method for the synthesis of 1,3,4-trisubstituted or 3,4-disubstituted pyrroles has been developed. The reaction represents the first time that pyrroles are synthesized directly from readily available aldehydes and amines (anilines) as starting materials. This method has been successfully applied to the rapid synthesis of purpurone.
Electrochemical oxidative annulation of amines and aldehydes or ketones to synthesize polysubstituted pyrroles
作者:Xinlong Gao、Pan Wang、Qingqing Wang、Jingting Chen、Aiwen Lei
DOI:10.1039/c9gc02118c
日期:——
A general and practical protocol to synthesize polysubstituted pyrroles has been established by electrooxidative annulation of amines and aldehydes or ketones. In an undivided cell, arylacetaldehydes and primary amines can participate in this transformation smoothly to furnish β-substituted pyrroles under external oxidant-free conditions. Tetrasubstituted pyrroles could be obtained efficiently by using
Manganese (III) acetate mediated synthesis of polysubstituted pyrroles under solvent-free ball milling
作者:Ji-Chao Zeng、Hui Xu、Fei Yu、Ze Zhang
DOI:10.1016/j.tetlet.2017.01.016
日期:2017.2
Under solvent-freeballmilling conditions, a simple and mild method was developed for efficient synthesis of 2,5-dimethyl-3,4-dicarboxylate-pyrroles and N-substituted 3,4-diphenylpyrroles via condensation-annulation of amines with acetoacetate and 2-phenylacetaldehyde, respectively. The use of cheap and safe Mn(OAc)3 as a mediator, no use of commonly employed acetic acid as solvent, short reaction
作者:Zhi He、Dennis Dobrovolsky、Piera Trinchera、Andrei K. Yudin
DOI:10.1021/ol303246b
日期:2013.1.18
By utilizing amino allenes, aldehydes, and aryl iodides as readily available building blocks, a simple and modular synthesis of multisubstituted pyridines with flexible control over the substitution pattern has been achieved. The method employs a two-step procedure involving the preparation of "skipped" allenyl imines and a subsequent palladium-catalyzed cyclization.