HETEROCYCLIC SYNTHESES WITH THIOLES AND NITRILES: SYNTHESIS OF SOME NEW PYRIMIDO[4′,5′:4,5] THIAZOLO[3,2-a], THIAZOLO[3,2-a] AND TRIAZOLO[3,2-a]-BENZIMIDAZOLE DERIVATIVES
作者:Abu Zeid Abd El Basat Hassanein
DOI:10.1080/10426509908044974
日期:1999.12
Abstract Treatment of 6-benzoylbenzimidazole-2-thiol(1) and 3-amino-6-benzoylthiazolo[3,2-a]-benzimidazole-2-carbonitrile (3) with various reagents under different conditions is reported to afford cyclized and uncyclized compounds of potential pharmacological interest.
Synthesis and Reactions of 3-Methylthiazolo[3,2-a]Benzimidazole-2-Carboxylic Acid Hydrazide: Synthesis of Some New Pyrazole, 1,3-Thiazoline, 1,2,4-Triazole and 1,2,4-Triazolo[3,4-b]-1,3,4-Thiadiazine Derivatives Pendant to Thiazolo[3,2-a]Benzimidazole Moi
作者:Hatem A. Abdel-Aziz、Nehal A. Hamdy、Ahmad M. Farag、Issa M. I. Fakhr
DOI:10.1002/jccs.200700222
日期:2007.12
4-thiadiazine derivatives 10a,b and 12a,b, respectively. Treatment of hydrazide 2 with phenyl isothiocyanate in refluxing benzene gave the thiosemicarbazide derivative 16. The latter reaction gave 1,3,4-oxadiazole derivative 17 when benzene was replaced by DMF. Cyclization of the thiosemicarbazide derivative 16 with NaOH resulted in the formation of the l,2,4-triazole-3-thione derivative 18.
Regioselective Synthesis of Novel 4,4′-and 5,5′-bi-(1,2,4-triazole) Derivatives
作者:Ahmad M. Farag、Kamal M. Dawood、Nabila A. Khedr
DOI:10.3184/030823407x237876
日期:2007.8
A regioselective synthesis is reported of a series of polysubstituted 1,2,4-triazoles and 4,4′- and 5,5′-bi-(1,2,4-triazoles) via 1,3-dipolar cycloaddition reactions of nitrilimines with some aza- and diaza-butadiene derivatives.
Synthesis and antimicrobial evaluation of some 1,2,4-triazole, 1,3,4-oxa(thia)diazole, and 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazine derivatives
作者:Kamal M. Dawood、Ahmad M. Farag、Hatem A. Abdel-Aziz
DOI:10.1002/hc.20162
日期:——
thiazolidine-2-thione 9 derivatives, respectively. The reaction of either 1,3,4-oxadiazole-5-thione 4 or 4-amino-1,2,4-triazole-5-thione 5 with phenacyl bromide resulted in the formation of 1,2,4-triazolo[3, 4-b]-1,3,4-thiadiazinederivative 8. Treatment of compounds 3 or 4 with hydrazonoyl halides 10a–d furn- ished the same 1,3,4-thiadiazol-2-ylidene derivatives 11a–d. The 7-arylhydrazono-1,2,4-triazolo[3,4-b]-1, 3
Reaction of Nitrilimines with 2-Substituted Aza-heterocycles. Synthesis of Pyrrolo[1,2-a]pyridine and Pyrimido[2,1-d]1,2,3,5- tetrazine
作者:Adel Awadallah、Jalal Zahra
DOI:10.3390/molecules13010170
日期:——
The reaction of nitrilimine 6a with ethyl pyridine-2-acetate (7) gave the corresponding pyrrolo[1,2-a]pyridine 8, while the reaction of 6b containing an ester moiety afforded the acyclic adduct 9. The reaction of 6a with 2-aminopyrimidine (10) gave the novel unexpected pyrimido[2,1-d]1,2,3,5-tetrazine 11. Acyclic adducts 16 and 17 were obtained from the reaction of 6b with 2-cyanomethylbenzimidazole