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Part-IExperimentalmethanolic 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. : 207-210 o C; Yield: 95%.Mol. formula : C 20 H 14 N 4 O 2 S 2 ; Mol. Wt. 406.4IR (KBr) cm -1 : 3193(γ NH ), 2971(γ C-H ), 1680(γ CONH ), 1046(γ S-O ), 740(γ C-S ).MS(m/e) : 368, 364, 335, 218.10. Synthesis of 2-{[(5-methoxy-1H-benzimidazol-2-yl)sulfinyl]methyl}-5-phenylthieno[2,3-d]pyrimidin-4(3H)-one(IVx)2-{[(5-Methoxy-1H-benzimidazol-2-yl)thio]methyl}-5-phenylthieno[2,3-d]pyrimidin-4(3H)-one (IIIx, 2. 26 gm; 0.0054 mole) was dissolved in 125 ml methanol and 100 mlmethylene dichloride by stirring at room temprature. Thereafter, the reaction mixture waschilled 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. : 195-198 o C; Yield: 91%.Mol. formula : C 21 H 16 N 4 O 3 S 2 ; Mol. Wt. 436.5.IR (KBr) cm -1 : 3120(γ NH ), 2883(γ C-H ), 1677(γ CONH ), 1046(γ S-O ), 697(γ C-S ).11. Synthesis of 2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-5-(4-methoxy-phenyl)-thieno[2,3-d]pyrimidin-4(3H)-one (IVxi).2-[(1H-Benzimidazol-2-ylthio)methyl]-5-(4-methoxyphenyl)thieno[2,3-d]pyrimidin-4(3H)-one (IIIxi, 2.26 gm; 0.0054 mole) was dissolved in 125 ml methanol and 100 mlmethylene dichloride by stirring at room temprature. Thereafter, the reaction mixture waschilled 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. : 214-218 o C; Yield: 77%.207