By Alan R. Katritzky (Ed.)
(from preface)Volume forty nine of Advances in Heterocyclic Chemistry includes 5 chapters. Professors M. Tiller and B. Stanovnik of the collage of Ljubljana, Yugoslavia conceal the growth in pyridazine chemistry on the grounds that 1979, the date in their prior e-book in quantity 24 of Advances.Professor Vorbruggen of Berlin has contributed a survey of the amination of nitrogen heterocycles, which bargains rather with aminations within which an ami no team replaces another performance at the heterocyclic ring. therefore, this overview enhances our contemporary evaluate in quantity forty four facing the Tschitschibabin response, within which a hydrogen atom at the heterocyclic ring is changed through an amino group.The different 3 chapters within the current quantity all care for bicyclic heterocycles. Dr. H. ok. Pujari of Kurukshetra collage in India describes condensed 4-thiazolidinones, and Professor M. A. E. Shaban and A. Z. Nasr of Alexandria collage in Egypt survey the synthesis of condensed 1,2,4-triazolo heterocycles. eventually, Professor T. A. Crabb of Portsmouth, England has lined saturated bicyclic 6/5 ring-fused structures with a bridgehead nitrogen and a unmarried extra heteroatom. None of those teams of bicyclic heterocycles has been comprehensively reviewed ahead of.
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Extra info for Advances in Heterocyclic Chemistry, Vol. 49
R1 CI Br Me Br Br CI Br Me Me Me SCHEME 68 of CS-H was small. For further confirmation of the cyclized products, the Japanese workers advanced excellent chemical evidence that involved the Raney-nickel desulfurization of cyclized products 2Wa,c-f and 291a,c-f. This resulted in the formation of I-acetyl-5(or 6)-substituted benzimidazoles whose identities were proved by direct comparison with authentic samples (82CPB2714). (288) (289) a. b. c, d, R R' H CI H H H Br Me OMe (290) e, f, g, R H H Br SCHEME 69 R1 NO2 CO2Me OMe (291) 52 H R U S H I K .
For further confirmation of the cyclized products, the Japanese workers advanced excellent chemical evidence that involved the Raney-nickel desulfurization of cyclized products 2Wa,c-f and 291a,c-f. This resulted in the formation of I-acetyl-5(or 6)-substituted benzimidazoles whose identities were proved by direct comparison with authentic samples (82CPB2714). (288) (289) a. b. c, d, R R' H CI H H H Br Me OMe (290) e, f, g, R H H Br SCHEME 69 R1 NO2 CO2Me OMe (291) 52 H R U S H I K . PUJARI ISec.
2-u]benzimidazol-3(2H)-ones (256a-d) [701JCIO; 71 KGS822; 861JC(B)2671(Scheme 62). 2-(rlbenzimidazol-3(2H)-one (257, R = Ph) and 2-arylhydrazinothiazolo[3,2-a]benzimidazol-3(2H)-ones (257, R = R'C6H4NH, R' = o-NO, R' = o-MeO, R' = p-Me) respectively (Scheme 63). Sodium salt of benzimidazolyl-2-thionc (247) reacts with hexafluoro- 1,2-epoxypropane in an aprotic solvent, such as dioxane or CH3CN, to give 2-fluoro-2-(trifluoromethyl)-thiazolo[3,2-a]benzimidazol-3(2H)-one(260) (81S981). 47) (259 1 SCHEME 63 (257) Sec.