New access to pyrazole, oxa (thia) diazole and oxadiazine derivatives

AA Hassan, KM El??Shaieb, RM Shaker…

Index: Hassan, Alaa A.; El-Shaieb, Kamal M.; Shaker, Raafat M.; Doepp, Dietrich Heteroatom Chemistry, 2005 , vol. 16, # 1 p. 12 - 19

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Citation Number: 26

Abstract

Abstract 1, 4-Disubstituted thiosemicarbazides 1b–f reacted with ethenetetracarbonitrile (5) in di-methylformamide with formation of 2-substituted 5-phenyl-1, 3, 4-thiadiazoles 2a–f and 2-substituted 5-phenyl-1, 3, 4-oxadiazoles 4a–f. Upon addition of 5 to 1c–e in chlorobenzene, 3-amino-2-benzoyl-4, 5, 5-tri-cyano-2, 5-dihydro-1H-pyrazole-1-[N-(4- tricyanovi-nyl) phenyl] carbothioamide (12), 5-benzylamino-, and 5-allylamino-4-benzoyl- ...