In an attempt to synthesize new derivatives of imidazo[1,5-a][1,5]benzodiazepine-3-carboxylic acid esters by activation of the amide group of the heterocycle to iminophosphate and its cyclocondensation with ethyl isocyanoacetate, unexpected 5-substituted ethyl oxazole-4-carboxylates were obtained as the main products. Structures of the novel oxazole derivatives were confirmed by IR, 1H, 13C, and 31P NMR, and mass spectra, and the reaction course was rationalized using computational molecular modeling techniques.
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Computations were performed on resources of the supercomputer ''VU HPC'' at the Vilnius University, Faculty of Physics.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2023, 59(4/5), 283–288
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Jonušis, M., Vektarienė, A., Mikulskienė, G. et al. Unexpected transformation of 1,5-benzodiazepine derivatives under imidazo-annulation reaction conditions. Chem Heterocycl Comp 59, 277–282 (2023). https://doi.org/10.1007/s10593-023-03194-y
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DOI: https://doi.org/10.1007/s10593-023-03194-y