11 research outputs found
Studies with Arylhydrazono-3-oxopropanals:A novel route to synthesis of substituted pyrazoles, oxoalkanonitrile and glyoxalonitrile containing sulfa drug moieties
Get PDFCoupling of enaminones 1 with diazonium salts gave thehydrazonopropanals 3a-h. Compound 3 react with ω-bromoacetophenone or α-chloroacetanilide to yield 5 and 8. These compounds were cyclized smoothly into 6 and 9 respectively. Reactions of 3 with phenylhydrazine gave diphenylhydrazones 10 which cyclized into arylazopyrazoles 11 in refluxing pyridine. However reaction of 3c-f with hydrazine hydrate afforded pyrazoles 12.Reactions of 3 with phenylhydrazine hydrochloride afforded 11. Finally, reactions of 3c with hydroxylamine hydrochloride afforded the aldoxime 14 that on refluxing in pyridine gave 15 not 16
SYNTHESIS OF PYRAZOLO[5',1':2,3]PYRIMIDO[4,5-b][1,4]-BENZOXAZINES, A NEW HETEROCYCLIC RING SYSTEM FROM 5(3)-AMINOPYRAZOLES
No full textActivated nitriles in heterocyclic synthesis: Syntheses of thiazole, pyrazole and 4H-1,4-benzothiazine derivatives
No full textSynthesis of 7-Aryl / chromonyl substituted benzopyrano[4,3-d]pyrazolo[1,5-a]pyrimidines by reaction of 5(3)-Aminopyrazoles
No full textNMR SPECTROSCOPIC AND X-RAY STRUCTURAL CHARACTERIZATION OF TWO DIARYL DERIVATIVES OF (4-CYANO-6-METHYL-3,8-DIOXO-2,3,5,6,7,8-HEXAHYDROPYRIDO[3,4-c] ΡYRIDAZIN-6-YL)HYDRAZONO-ACETIC ACID ETHYL ESTER
No full textReactions with heterocyclic amidines (V). Synthesis of some new imidazo[1,2-b] pyrazole, pyrazolo [5,1-c]-1,2,4-triazine and pyrazolo [5,1-c]-1,2,4-triazole derivatives
No full textReactions with halogenated compound: Synthesis of several new pyrazolo[3,2-c] triazine and 2-benzenesulfonylglyoxal arylhydrazone derivatives
No full textSYNTHESIS OF ETHYL PYRROLE-2-CARBOXYLATES: A REGIOSELECTIVE CYCLIZATION OF ENAMINONES UNDER KNORR-TYPE CONDITIONS
No full textReactions with heterocyclic amidines (VI): Synthesis of some new sym. and assym. pyrazolotriazines and pyrazolo[4,5-e]pyrimidine derivatives
No full textThienobenzothiopyranones III new 4H-thieno[2,3-b][1]benzothiopyran-4-ones carrying different heterocyclic moieties of expected pharmacological interest
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