Preparation and NMR characterization of new substituted benzo[a]phenazines

Abstract

Benzo[a]phenazines were prepared by condensation of β-lapachone with 1,2-phenylenediamme and 4-chloro-1,2-phenylenediamine. The latter diamine gave two regioisomers that could be separated and unambiguously identified by means of their 1H and 13C NMR spectra with the aid of 2D NMR experiments, mainly HETCOR and COLOC. © 1998 John Wiley & Sons, Ltd.