NMR characterization of new 10-membered-ring macrolactones and dihydrobenzophenazine-5-one, oxidized derivatives of benzo[a]phenazines |
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Authors: | Goulart Marília O F Machado Reys José Rui Emery Flavio S Pinto Antônio V de Souza Filho José Dias |
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Institution: | Departamento de Química, Universidade Federal de Alagoas, 57092-970 Maceió, Alagoas, Brazil. mofg@qui.ufal.br |
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Abstract: | Peroxidation of the phenazine of beta-lapachone using m-ClC6H4CO3H-CH2Cl2 furnished a macrolactone with a rigid 10-membered ring, and the corresponding N-oxide, along with a dihydrobenzophenazine-5-one. All of the new compounds were fully characterized by spectroscopic methods, with the unambiguous assignment of the hydrogens and carbon NMR signals for the N-oxide, with the aid of 2-D NMR, mainly COSY, HMQC, HSQC and HMBC. For the other two compounds some signals could not be assigned owing to their own intrinsic features. |
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Keywords: | NMR 1H NMR 13C NMR benzo[a]phenazines quinoxalinic macrolactones dihydrobenzophenazine‐5‐one |
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