Chemistry of Heterocyclic Compounds p. 175 - 183 (1997)
Update date:2022-07-29
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The direction of the reaction of derivatives of N-ethoxycarbonylmethylpyridinium bromide with chalcone in the presence of bases depends on the substituent at position 3 of the pyridine ring. In the presence of a pyridyl substituent a derivative of 2,3-dihydroindolizine is formed. In the case of a 1,4-dihydropyridyl substituent cycloaddition does not occur, and a Michael addition product (an acyclic betaine) is formed. The latter can be transformed into a derivative of indolizine only under the conditions of decarboxylation. 1997 Plenum Publishing Corporation.
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Doi:10.1016/S0022-1139(97)00091-2
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