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The reaction of 3,5-dichloro-4H-1,2,6-thiadiazin-4-one with (R) and (S)-1,3-dimethylpiperazines (1 equiv), in THF, at ca. 20 °C gives (R) and (S)-3-chloro-5-(2,4-dimethylpiperazin-1-yl)-4H-1,2,6-thiadiazin-4-ones in 70% and 68% yields, respectively. The new compounds were fully characterized.

Synthesis of (R) and (S)-3-Chloro-5-(2,4-dimethylpiperazin-1-yl)-4H-1,2,6-thiadiazin-4-ones