Patent ID: 8329898

Claim:
A method for preparing a 5,6-dihydropyrido[3,2-h]quinazoline 7, wherein a benzylidene hydroquinolinone is reacted with benzamidinium hydrochloride under basic condition to prepare a 1,4,5,6-tetrahydropyrido[3,2-h]quinazoline, and oxiding the 1,4,5,6-tetrahydropyrido[3,2-h]quinazoline: wherein: R 1 and R 2 are selected independently from a, substituted or unsubstituted, aryl, heteroaryl, alkyl of the formula CHR 2 , or alkyl of the formula CR 3 ; R 3 is selected from H, or a, substituted or unsubstituted, C 1 -C 20 alkyl, aryl, or heteroaryl; and R 4 is selected from H, or a, substituted or unsubstituted, C 1 -C 20 alkyl, aryl, heteroaryl, NH 2 , NHR, NR 2 , N-alkylaryl, N-aryl 2 , carbazolyl, dibenzaepinyl, or CN, wherein each R is selected independently from a C 1 -C 20 alkyl.