Bridgehead Nitrogen Heterocycles. Synthesis and various Reactions of 5-(2-Morpholinoquinoxaline-3-yl)- 4-amino-3-mercapto-4H-1 ,2,4-triazole

N. S. Research Laboratories, St. Xavier's College, Bomb&y-4.00 001 Manuscript received 27 July 1987, revised 21 September 1981, accepted 2 December 1981 4-Amino-3-mercapto-5-(2-morpholinoquinoxalin- 3-yl)- 4H-1,2,4-triazole (1), prepared by treating 2-morpholinoqufnoxaline-3-acid hydrazide successively with CS, -KOH and NH2 NH2, gives the nitrogen bridge head fused heterocycles 2, 3, 4 and 6 on reacting with CS2 RCOOH, PhCONCS and PhCOCH2Br, respectively