Journal
TETRAHEDRON LETTERS
Volume 49, Issue 26, Pages 4138-4141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.04.119
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5-Substituted dipyrromethane analogues (8), (23) and (25) were synthesized by the reaction of 2-vinyl-pyrroles, 2-vinylthiophene or 2-vinylbenzenes with excess pyrrole in the presence of Lewis acids. Accordingly, tripyrromethane analogues could be obtained by starting with 2,5-divinyl thiophene or 2,6-divinylbenzenes. The reaction usually gave moderate yields and catalyst-dependent was seen in some cases. The reaction is compatible with other reported dipyrromethane syntheses and could be applied for the construction of unusual porphyrins. (C) 2008 Elsevier Ltd. All rights reserved.
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