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Synthetic pathways to prepare derivatives of 6-(morpholine-4-sulfonyl)-1,4-dihydroquinoxaline (97,98,99,100,101) with reagents and conditions: (a) POCl3, (b) thiocarbohydrazide (i) acetonitrile/reflux/8 h, (c) 5-hydroxy-3-methyl-1H-pyrazole-1-carbothiohydrazide (ii)/acetonitrile/reflux/8 h, (d) 4- amino-5-methyl-4H-1,2,4-triazole-3-thiol (iii) in acetonitrile containing DMF/reflux/5 h.
