Sarmah BK, Konwar M, Das A. Site-Selective Deoxygenative Amination of Azine
N-Oxides with Carbodiimides under Catalyst-, Activator-, Base-, and Solvent-Free Conditions.
J Org Chem 2021;
86:10762-10772. [PMID:
34260234 DOI:
10.1021/acs.joc.1c00741]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An operationally simple method for synthesizing 2-amino azines via [3+2] dipolar cycloaddition of azine N-oxide with carbodiimide has been demonstrated. The reaction can proceed smoothly under simple heating conditions without any transition metal catalyst, activator, base, and solvent. This transformation demonstrates a broad substrate scope and produces CO2 as the only co-product. The applicability of this method is highlighted by the late-stage modification of bioactive molecules, including quinine, (±)-α-tocopherol, and tryptamine modified quinoline.
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