Remarkable Conversion of 2-Thioxo-2,3-dihydroquinazolin-4(1H)-ones into the Corresponding Quinazoline-2,4(1H,3H)-diones: Spectroscopic Analysis and X-Ray Crystallography

Table 1

Reaction of quinazolinthione with sodamide in methanol.

Entry	Compd. No.	X	R	Time (h)	Yield (%)
1	9	H	Ph	10	82
2	10	H	Bn	8	80
3	11	CH3	Ph	10	86
4	12	NO2	Ph	12	79
5	13	NO2	Bn	10	78
6	14	Cl	Ph	8	81
7	15	Cl	Bn	9	83
8	16	I	ph	10	85