Chadar, D.; Rao, S.S.; Gejj, S.P.
(2016-11-17)
A novel acid catalyzed regioselective Michael addition of o-phenylenediamine to vitamin K3 has been carried out to synthesize a dihydrobenzophenazine derivative viz. 6a-methyl-6a,7-dihydrobenzo[α]phenazin-5(6H)-one (1). ...