Quiazolinesexpecially 4-oxoquinszolines are physiologically active compounds possessing various biological and pharmacological activities. The physiological and pharmacological activity in the naturally occuringquinazolines and in most of the synthetic products was found to be due to the 4-oxo moiety present in them. 3-Amino-2 methyl-3,4-dihydro-4-oxo quinazolines was first prepared by Bogert and Seil. Out of the various synthetic routs available, Klosa's method of preparing such amino methylxoquinazolines from 3,1,4benzoxazones with Lal'smodification appeared more attractive to us, owing to its simplicity and convenience of not isolating the intermediates with good yields. Furthermore mechanistic investigation of this reaction by Erredeet al. prevented any pitfalls for us. Klosa's method with Lal's modification was used to prepare a number of 8-methyl/ methoxy substituted 3-amino-2-alky/aryl-3,4 dihydro-4-oxoquinazolines. Following a reported method with slight modification 2,4- DNP derivatives of these 4-oxoquinazolines were prepared and characterised by various physico-chemical methods