Abstract
Reduction of 2-benzoylbenzoxazole oxime gives 2-(α-aminobenzyl) benzoxazole, converted to the formyl or acetyl derivative by treatment with, respectively, ethyl formate or acetic anhydride. Thiourea derivatives are obtained by treating 2-(α-aminobenzyl) benzoxazole with arylisothiocyanates. Heating the above formyl or acetyl derivative with phosphorus oxychloride converts them to 3-phenyl- and 3-phenyl-1-methylimidazo [5, 1-b]-benzoxazole, which are representative members of a new tricyclic system. It did not prove possible to cyclize 1-[α-(benzoxazolyl-2) benzyl]-3-phenylthiourea.
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Sycheva, T.P., Kiseleva, I.D. & Shchukina, M.N. Synthesis of 3-phenyl- and 3-phenyl-1-methylimidazo [5, 1-b] benzoxazoles. Chem Heterocycl Compd 2, 529–531 (1966). https://doi.org/10.1007/BF00477511
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DOI: https://doi.org/10.1007/BF00477511