C(Cl)(=O)C(Cl)=O.CS(C)=O.[Cl:11][CH2:12][CH2:13][C:14]1[C:19](=[O:20])[N:18]2[CH2:21][CH2:22][CH2:23][CH:24]([OH:25])[C:17]2=[N:16][C:15]=1[CH3:26].C(N(CC)CC)C>ClCCl>[Cl:11][CH2:12][CH2:13][C:14]1[C:19](=[O:20])[N:18]2[CH2:21][CH2:22][CH2:23][C:24](=[O:25])[C:17]2=[N:16][C:15]=1[CH3:26]A solution of oxalylchloride (8.8 ml) in dichloromethane (20 ml) was cooled to −65° C. and a solution of dimethyl sulfoxide (6.5 ml) dissolved in dichloromethane (20 ml) was added to it slowly and stirred for 30 min. keeping the temperature at −65° C. a solution of 3-(2-chloroethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (5 grams) (formula-7) dissolved in dichloromethane (30 ml) was added to it very slowly and stirred for 40 min. Triethyl amine was added to the reaction mixture and then quenched with water. The organic layer was separated, washed with aqueous sodium carbonate and water. The solvent from the organic layer was distilled off under reduced pressure to provide the title compound.
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