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Part-IExperimentalhexahydro-4H-cyclohepta[4,5]thieno[2,3-d]pyrimidin-4-one (IVxxiii)23. Synthesis of 2-{[(5-methoxy-1H-benzimidazol-2-yl)sulfinyl]methyl}-3,5,6,7,8,9-2-{[(5-Methoxy-1H-benzimidazol-2-yl)thio]methyl}-3,5,6,7,8,9-hexahydro-4H-cyclohepta[4,5]thieno[2,3-d]pyrimidin-4-one(IIIxxiii, 2.2 gm; 0.0054 mole) was dissolved in125 ml methanol and 100 ml methylene dichloride by stirring at room temprature.Thereafter, the reaction mixture was chilled in an ice salt bath while maintaining thetemperature below 0 o C. To this clear solution, methanolic solution of m-CPBA (1.16 gm;0.0065 mole) was added while stirring 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. : 155-160 o C; Yield: 44%.Mol. formula : C 20 H 20 N 4 O 3 S 2 ; Mol. Wt. 428.5.IR (KBr) cm -1 : 3269(γ NH ), 2909(γ C-H ), 1672(γ CONH ), 1048(γ S-O ), 804(γ C-S ).MS(m/e) : 408, 393, 380, 365, 352, 323, 309, 18024. Synthesis of 2-((1H-benzo[d]imidazol-2-ylsulfinyl)methyl)quinazolin-4(3H)-one(IVxxiv)2-((1H-Benzo[d]imidazol-2-ylthio)methyl)quinazolin-4(3H)-one (IIIxxiv, 1.66 gm;0.0054 mole) was dissolved in 125 ml methanol and 100 ml dichloromethane by stirringat room temprature. Thereafter, the reaction mixture was chilled in an ice salt bath whilemaintaining 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 the reation was continued for30-45 mins. After completion of the reaction, worked up was done as for the compoundIVi.M.P. : 175-177 o C; Yield: 56%Mol. Formula : C 16 H 12 N 4 O 2 S; Mol. Wt. 324.3IR (KBr) cm -1 : 3059(γ NH ), 1676(γ CONH ), 1052(γ S-O ), 741(γ C-S ).25. Synthesis of 2-((5-methoxy-1H-benzo[d]imidazol-2-ylsulfinyl)methyl)quinazolin-4(3H)-one (IVxxv)2-((5-Methoxy-1H-benzo[d]imidazol-2-ylthio)methyl)quinazolin-4(3H)-one (IIIxxv, 1.8gm; 0.0054 mole) was dissolved in 125 ml methanol and 100 ml dichloromethane bystirring at room temprature. Thereafter, the reaction mixture was chilled in an ice salt bath213