Novel clay-mediated, tandem addition–elimination-(Michael) addition reactions of indoles with 3-formylindole: an eco-friendly route to symmetrical and unsymmetrical triindolylmethanes
作者:Manas Chakrabarty、Sandipan Sarkar
DOI:10.1016/s0040-4039(01)02380-2
日期:2002.2
Dry reaction of 3-formylindole (1) with indole (2a) on Montmorillonite K10 clay at room temperature furnished within minutes tris(indol-3-yl)methane (3a) in high yield. The reaction of 1 with other mono- and dialkylindoles (2b-c, skatole. 8a-c) under similar conditions yielded either or both of symmetrical (3b c. 9) and unsymmetrical (4b c. 5b c. 10, 11a-c) triindolylmethanes, (C) 2002 Elsevier Science Ltd. All rights reserved.