Abstract A decarboxylative hydroamination cascade reaction of 3-arylpropiolic acids with N-heterocycles under transition-metal-free conditions was developed. 3-Arylpropiolic acids were found to react smoothly with a range of N-heterocycles under the effect of t-BuOK to afford N-vinyl heterocycles in moderate to excellent yields. This reaction represents the first decarboxylative hydroamination of 3-arylpropiolic
In the presence of catalytic amounts of cesium hydroxide (CsOH·H2O), alcohols, substituted anilines and heterocyclic amines undergo an addition in NMP to phenylacetylene leading to functionalized enol ethers and enamines. Anilines add to styrene (90–120°C, 12–14 h) leading to N-substituted anilines in satisfactory yields.
Expedient one-step synthesis of nitrogen stilbene analogs by transition metal-free hydroamination of arylacetylenes with pyrroles
作者:Marina Yu. Dvorko、Elena Yu. Schmidt、Tatyana E. Glotova、Dmitrii A. Shabalin、Igor' A. Ushakov、Vladimir B. Kobychev、Konstantin B. Petrushenko、Al'bina I. Mikhaleva、Boris A. Trofimov
DOI:10.1016/j.tet.2011.12.050
日期:2012.2
A novel family of nitrogen stilbene analogs, 1-styrylpyrroles, has been synthesized in good to excellent yields by a straightforward facile transition metal-free addition of pyrroles to arylacetylenes in the KOH/DMSO system (90-120 degrees C, 5-13 h). Thermodynamically controlled E/Z-isomer ratio of 1-styrylpyrroles depends on structure of both pyrroles and acetylenes ranging from ca. 100% E-stereoselectivity (for the pair unsubstituted pyrrole phenylacetylene) to 90, 96% Z-stereoselectivity (for the pairs: 2-phenylpyrrole-phenylacetylene and 2-(2-thienyl)pyrrole-phenylacetylene, respectively). (C) 2011 Elsevier Ltd. All rights reserved.