Bromination of 2-acylamino-3-ethoxycarbonyl-7-oxo-4,5,6,7-tetrahydrobenzo[b]-thiophenes has been studied. This reaction affords 2-acylamino-6,6-dibromo-3-ethoxycarbonyl-7-oxo-4,5,6,7-tetrahydrobenzo[b]thiophene, which on dehydrobro-mination gives 6-bromo-7-oxybenzo[b]thiophene derivatives. The 4,6-dibromo- and 4,6-dinitro-7-oxybenzo[b]thiophenes were also obtained.
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I. A. Kharizomenova, M. V. Kapustina, A. N. Grinev, Yu. N. Sheinker, L. M. Alekseeva, and E. F. Kuleshova, Khim. Geterosikl. Soedin., No. 2, 1626 (1984).
K. Gewald and G. Neumann, Chem. Ber., 101, 1933 (1968).
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 460–462, April, 1987.
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Grinev, A.N., Kharizomenova, I.A., Kapustina, M.V. et al. Synthesis of derivatives of 2-acylamino-7-oxybenzo[b]thiophene. Bromination and nitration. Chem Heterocycl Compd 23, 384–386 (1987). https://doi.org/10.1007/BF00546729
- Organic Chemistry
- Thiophene Derivative