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Part-IExperimentalwhile maintaining the temperature below 0 o C. To this clear solution, methanolic solutionof m-CPBA (1.16 gm; 0.0065 mole) was added while stirring and the reation wascontinued for 30-45 mins. After completion of the reaction, worked up was done as forthe compound IVi.M.P. : 110-112 o C; Yield: 60%Mol. Formula : C 17 H 14 N 4 O 3 S; Mol. Wt. 354.3IR (KBr) cm -1 : 3351(γ NH ), 3076(γ C-H ), 1681(γ CONH ), 1029(γ S-O ), 776(γ C-S )26. Synthesis of 2-(1H-benzoimidazol-2-sulfinylmethyl)-6,8-dimethyl-3H-9-thia-1,3,5-triazafluoren-4-one (IVxxvi)6-(1H-benzoimidazol-2-ylsulfanylmethyl)-2,4-dimethyl-7H-9-thia-1,5,7-triazafluoren-8-one (IIIxxvi, 2.1 gm; 0.0054 mole) was dissolved in 125 ml methanol and 100 mlchloroform by stirring at room temprature. Thereafter, the reaction mixture was chilled inan ice salt bath while maintaining the temperature below 0 o C. To this clear solution,methanolic solution of m-CPBA (1.16 gm; 0.0065 mole) was added while stirring and thereation was continued for 30-45 mins. After completion of the reaction, worked up wasdone as for the compound IVi.M.P. : 140-143 o C; Yield: 60%Mol. Formula : C 19 H 15 N 5 O 2 S 2 ; Mol. Wt. 409.4IR (KBr) cm -1 : 3345(γ NH ), 3030(γ C-H ), 1685(γ CONH ), 1040(γ S-O ), 768(γ C-S ).27. Synthesis of 2-(5-methoxy-1H-benzoimidazol-2-sulfinylmethyl)-6,8-dimethyl-3H-9-thia-1,3,5-triazafluorene 4-one (IVxxvii)6-(5-Methoxy-1H-benzoimidazol-2-ylsulfanylmethyl)-2,4-dimethyl-7H-9-thia-1,5,7-triazafluoren-8-one (IIIxxvii, 2.2 gm; 0.0054 mole) was dissolved in 125 ml methanoland 100 ml chloroform by stirring at room temprature. Thereafter, the reaction mixturewas chilled in an ice salt bath while maintaining the temperature below 0 o C. To this clearsolution, methanolic solution of m-CPBA (1.16 gm; 0.0065 mole) was added whilestirring and the reation was continued for 30-45 mins. After completion of the reaction,worked up was done as for the compound IVi.M.P. : 160-162 o C; Yield: 64%214