Réduction électrochimique de 4 H-1, 3-thiazines: obtention de 6 H-1, 3-thiazines et (ou) de pyrroles substitués
A Abouelfida, JP Pradère, M Jubault…
Index: Abouelfida, Abdesselam; Pradere, Jean Paul; Jubault, Michel; Tallec, Andre Canadian Journal of Chemistry, 1992 , vol. 70, # 1 p. 14 - 20
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Abstract
Controlled potential electroreduction (protic medium, mercury cathode) of substituted 2- ethoxy and 2-phenyl-4 H-1, 3-thiazines leads to 6 H-1, 3-thiazines and (or) pyrroles. The nature of the isolated products appears strongly dependent on pH of the medium and type of substitution: pyrrole formation takes place in acidic medium (0.5 mol L-1 H2SO4) and is favoured by phenyl and alkoxycarbonyl groups at positions 2 and 4, respectively; ...
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