Boric Acid–Mediated Mild and Efficient Friedel–Crafts Alkylation of Indoles with Nitro Styrenes
作者:H. M. Meshram、N. Nageswara Rao、G. Santosh Kumar
DOI:10.1080/00397910903457316
日期:2010.11.3
An efficient method has been developed for the synthesis of indole 3-derivatives by the Friedel–Crafts alkylation of indole with nitroolefins in presence of boric acid in aqueous medium.
Silica Gel, an Effective Catalyst for the Reaction of Electron-Deficient Nitro-Olefins with Nitrogen Heterocycles
作者:Abdullah M. A. Shumaila、Radhika S. Kusurkar
DOI:10.1080/00397910903340694
日期:2010.8.31
The reaction of electron-deficientolefins with nitrogen heterocycles such as pyrrole and indole was examined in the presence of silica gel at room temperature under stirring at solvent-free conditions. It was found that silica gel is an effective catalyst for this conjugate addition. This work resulted in the formation of monosubstituted pyrroles selectively as a major product except in a few cases
Thermal and Microwave‐Assisted Conjugate Additions of Indole on Electron‐Deficient Nitro‐olefins
作者:Radhika S. Kusurkar、Nabil A. H. Alkobati、Anita S. Gokule、Purnima M. Chaudhari、Prasad B. Waghchaure
DOI:10.1080/00397910500498788
日期:2006.5
Abstract Conjugate addition of indole on nitro‐olefins was carried out by three different methods: (i) thermal heating in a sealed tube, (ii) reaction with indolyl magnesium iodide, and (iii) microwave irradiation. Comparison of the results indicated that the microwave technique is most efficient.