A new class of C-2-symmetric bis-indole derivatives with 2,2'-linkage has been synthesized from bis-propargyl sulfones. The method involves treatment of the sulfones with catalytic amount of triethylamine to form the indole derivatives presumably via the intramolecular Michael addition to the intermediate bis-allenic sulfones. Interestingly, the expected Garratt-Braverman pathway was not followed. (C) 2009 Elsevier Ltd. All rights reserved.
A new class of C-2-symmetric bis-indole derivatives with 2,2'-linkage has been synthesized from bis-propargyl sulfones. The method involves treatment of the sulfones with catalytic amount of triethylamine to form the indole derivatives presumably via the intramolecular Michael addition to the intermediate bis-allenic sulfones. Interestingly, the expected Garratt-Braverman pathway was not followed. (C) 2009 Elsevier Ltd. All rights reserved.
A new class of C-2-symmetric bis-indole derivatives with 2,2'-linkage has been synthesized from bis-propargyl sulfones. The method involves treatment of the sulfones with catalytic amount of triethylamine to form the indole derivatives presumably via the intramolecular Michael addition to the intermediate bis-allenic sulfones. Interestingly, the expected Garratt-Braverman pathway was not followed. (C) 2009 Elsevier Ltd. All rights reserved.