Monatshefte fur Chemie p. 195 - 204 (1998)
Update date:2022-09-26
Topics:
Fangh?nel, Egon
Werdofa, Mezgebu
Hucke, André
Lochter, Thomas
Due to their masked 1,5-dicarbonyle structure, 1,2-thiazine-6-carbaldehydes (1) undergo a ring transformation with aliphatic amines and diamines to give substituted pyridinium-3-sulfonamidates 2-6 and bis-(pyridinium-3-sulfonamidates) 7-9, respectively. With bioactive β-substituted ethylamines, pyridinium derivatives 12-20 with potential biological activity were obtained. Under acidic conditions, the thiazine-6-carbaldehydes 1a-d react with tryptamine to give substituted 9H-tetrahydropyrido[3,4-b]indoles 22a-d (Harman type alcaloids). 22a was dehydrogenated to the corresponding pyrido-indole 23a by palladium coal.
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Doi:10.1016/S0040-4020(98)83017-2
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