Tetrahedron Letters

Novel clay-mediated, tandem addition–elimination-(Michael) addition reactions of indoles with 3-formylindole: an eco-friendly route to symmetrical and unsymmetrical …

M Chakrabarty, S Sarkar

Index: Chakrabarty, Manas; Sarkar, Sandipan Tetrahedron Letters, 2002 , vol. 43, # 7 p. 1351 - 1353

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Citation Number: 69

Abstract

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.

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