Abstract
Halocyclization of mesylates or tosylates of 2-(cycloalk-2-en-1-yl)anilines gives N-methanesulfonyl-or N-toluenesulfonyl-1-halo-1,2,3,4,4a,9a-hexahydrocarbazoles, heating of which in DMF at 160°C or in piperidine at 110°C leads to 4,4a,9,9a-tetrahydro-3H-carbazoles. Heating N-methanesulfonyl-1-iodo-1,2,3,3a,4,8b-hexahydrocyclopenta[b]indole in DMF at 180—200°C gives 1,3a,4,9b-tetrahydrocyclopenta[b]indole, while in the presence of an ortho-methyl substituent the dehydroiodination reaction proceeds in piperidine at 110°C in high yield. The effect of the nature of the ortho substituent of N-methyl-1-iodo-1,2,3,3a,4,8b-hexahydrocyclopenta[b]indole on the conformational equilibrium of the cyclopentane ring has been established by 1H NMR spectroscopy.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1184–1190, August, 2006.
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Gataullin, R.R., Ishberdina, R.R., Shitikova, O.V. et al. Preparation of 4,4a,9,9a-tetrahydrocarbazoles and 1,3a,4,8b-tetra-hydrocyclopenta[b]indoles. Chem Heterocycl Compd 42, 1025–1031 (2006). https://doi.org/10.1007/s10593-006-0199-7
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DOI: https://doi.org/10.1007/s10593-006-0199-7