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Communication | Special issue | Vol 11, No. 1, 1978, pp.275-280
Published online, 1st January, 1970
DOI: 10.3987/S(N)-1978-01-0275
Seven-membered N-Heterocycles. XV. Ethyl 2-Phenyl-7H-pyrimido[4,5-d]azepine-7-carboxylate

Hiroshi Yamamoto,* Takao Komazawa, Kazuyuki Nakaue, and Akira Yokoo

*Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan


The title azepine (6) was derived from the 6,7,8,9-tetrahydro-5H-pyrimido[4,5-d]azepine (2) via 6,7-dihydro-5H-derivative (3a) by the stepwise dehydrogenation. The 8,9-dihydro-7H-pyrimidoazepine (4a) was also prepared. The structures are discussed on the basis of uv, ir, and nmr spectra.