3-Ethylhexahydropyrazino[3,2,1-jk]carbazole is converted into hexahydro[1,4]diazocino[7,8,1-jk]carbazoles by the action of methyl propiolate and acetylacetylene in acetonitrile and into 1-methoxy9-(β-vinylethylamino)ethylcarbazoles by the action of acetylenedicarboxylic ester and methyl propiolate in methanol. 3-Benzyl-substituted pyrazinocarbazole does not react with alkynes.
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Deceased (V. G. Granik).
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 665-669, April, 2012.
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Voskressensky, L.G., Granik, V.G., Borisova, T.N. et al. Synthesis of hexahydro[1,4]diazocino[7,8,1-jk]carbazoles and 1-methoxy-9-(β-vinylethylamino)ethylcarbazoles. Chem Heterocycl Comp 48, 620–624 (2012). https://doi.org/10.1007/s10593-012-1035-x
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DOI: https://doi.org/10.1007/s10593-012-1035-x