Magnetic Resonance in Chemistry 2005-07-01

1H and 13C NMR identification of unexpected 3,4-dihydroquinoxalines in the syntheses of 1,5-benzodiazepine derivatives.

E M Tjiou, E G Lhoussaine, D Virieux, A Fruchier

Index: Magn. Reson. Chem. 43(7) , 557-62, (2005)

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Abstract

The reaction between o-phenylenediamines, dehydroacetic acid and aromatic aldehydes is shown to give not only the expected 1,5-benzodiazepine derivative but also a 3,4-dihydroquinoxaline, the structure of which was determined by its 1H and 13C 1D and 2D NMR spectra.Copyright 2005 John Wiley & Sons, Ltd