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A solution of 2,2,2-trichloroethyl α-thioformamidodiethylphosphonoacetate (3.87 g.) in acetone (50 ml.) is treated with powdered potassium carbonate (4.15 g) and 1-chloro-3-methoxymethyloxy-propan-2-one (1.60 g.). The mixture is stirred for 4 hrs. at room temperature under a nitrogen atmosphere, then filtered. Evaporation of the filtrate leaves a residue which is dissolved in methylene chloride. The solution is washed with dilute aqueous dipotassium hydrogen phosphate and water, dried over magnesium sulfate, filtered and evaporated in vacuo affording 2,2,2-trichloroethyl 5-methoxymethyloxymethyl-6H-1,3-thiazine-4-carboxylate.

1. filtrationat room temperature under a nitrogen atmosphere, then filtered
2. customEvaporation of the filtrate
3. customleaves a residue which
4. washThe solution is washed with dilute aqueous dipotassium hydrogen phosphate and water
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customevaporated in vacuo