Novel xanthine oxidase inhibitor studies. Part 2.1 Synthesis and xanthine oxidase inhibitory activities of 2-substituted 6-aIkylidenehydrazino- Or 6-arylmethyIidenehydrazino-7A-purines and 3- and/or 5-substituted 9H-1,2,4-triazolo[3,4-i]purines
The facile and general synthesis of 2-substituted 6-alkylidenehydrazino- or 6-arylmethylidenehydrazino-7//-purines and 3- and/or 5-substituted 9//-l,2,4-triazolo[3,4-/]purines, which were obtained by oxidative cyclisation of the corresponding 6-aldehyde h