An initial study has been accomplished into the synthetic feasibility of the preparation of diarylcarbenium salt via the direct coupling of aryl (or heteroaryl) aldehydes and arenes (or heteroaryl analogues) in the presence of a strong organic Brønsted acid. A number of stabilized aryl or heteroaryl(3-indolyl)carbenium ions, never previously prepared in the solid state, have been isolated in excellent
Introducing tetramethylurea as a new methylene precursor: a microwave-assisted RuCl<sub>3</sub>-catalyzed cross dehydrogenative coupling approach to bis(indolyl)methanes
作者:Mohit L. Deb、Paran J. Borpatra、Prakash J. Saikia、Pranjal K. Baruah
DOI:10.1039/c6ob02671k
日期:——
Herein we report a microwave assisted Ru(III)/TBHP-mediated reaction of indoles with tetramethylurea (TMU) synthesizing symmetrical as well as unsymmetrical bis(indolyl)methanes, where TMU acts as a methylenating agent. This is the first report where TMU is used as a methylene source. Moreover, the synthesis of unsymmetrical bis(indolyl)methanes by using a carbon precursor is also reported herein for