Generation and trapping of non-aromatic cycloimines via diazotization/dediazotization of N-amino cyclic amines: theoretical and experimental results


A theoretical investigation of the model diazotization/dediazotization of N-aminopiperidine and N-aminomorpholine at the DFT (B3LYP/6-31+G(d)) level indicated that the corresponding cycloimines can be generated transiently, which can be trapped with dimethyl acetylenedicarboxylate (DMAD) to form a 1,4-dipole followed by cycloaddition of the latter with a second molecule of DMAD to give the corresponding pyrido-annelated products. All steps have low activation free energy barriers and are thermodynamically favoured. Based on the theoretical results, we carried out successfully diazotization of N-amino cyclic amines, namely N-aminopiperidine, 4-aminomorpholine and 1-amino-4-methylpiperazine with tert.-butyl nitrite followed by dediazotization to generate transiently the corresponding cycloimines, which could be trapped with dimethyl acetylenedicarboxylate. to afford new annelated pyridine derivatives, namely tetramethyl 9H-5,6,7,8-tetrahydroquinolizine-1,2,3,4-tetracarboxylate, tetramethyl 5,6,8,9-tetrahydropyrido[2,1-c][1,4]oxazine-1,2,3,4-tetracarboxylate and tetramethyl 9H-5,6,7,8-tetrahydro-7-methylpyrido[1,2-a]pyrazine-1,2,3,4-tetracarboxylate which were duly characterized.

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We acknowledge the support of the authorities of the IIS (deemed to be University), Jaipur (India) for providing research facilities. We thank the anonymous reviewer for giving valuable suggestions.

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Correspondence to Raj K. Bansal.

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The IR, and 1H NMR spectra of the products; total energies of all the species in the gas phase (Table S1), and Cartesian coordinates of the optimized species at the B3LYP/6-31+G* level (Table S2). Supplementary data related to this article can be found at http://-------. (DOCX 2300 kb).

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Ojha, M., Bansal, R.K. Generation and trapping of non-aromatic cycloimines via diazotization/dediazotization of N-amino cyclic amines: theoretical and experimental results. Struct Chem (2020).

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  • 1,4-Dipoles
  • Annelated pyridines
  • Tetramethyl 9H-5,6,7,8-tetrahydroquinolizine-1,2,3,4-tetracarboxylate
  • Tetramethyl 5,6,8,9-tetrahydropyrido[2,1-c][1,4]oxazine-1,2,3,4-tetracarboxylate
  • Tetramethyl 9H-5,6,7,8-tetrahydro-7-methylpyrido[1,2-a]pyrazine-1,2,3,4-tetracarboxylate
  • DFT calculations