Ethyl 4-chloroacetoacetate → S-[(3,4-Dihydro-2-(1-methylethyl)-4-oxo-6-pyrimidinyl)methyl] O,O-dimethyl phosphorodithioate

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The intermediate, 6-(chloromethyl)-2-(1-methylethyl)-4(1H)pyrimidinone, was prepared according to Swiss patent 524617 from ethyl 4-chloroacetoacetate and isobutyramidine. m.p. 123°-125°. The intermediate chloromethyl compound (25 g) was stirred with 50 ml methanol at room temperature. To this mixture was added, dropwise, a solution of 25 g ammonium dimethyl phosphorodithioate dissolved in 500 ml methanol. The mixture was then heated to reflux for 6 hours, then the solvent was evaporated under reduced pressure yielding a solid. The solid was dissolved in dichloromethane and washed with water, separated, dried, and the solvent was evaporated. The remaining solid was recrystallized from toluene; yield: 15.9 g, m.p. 89°-93°.

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