Cl[C:2]1[S:6][N:5]=[C:4]([CH3:7])[N:3]=1.[CH3:8][N:9]1[CH2:14][C@@H:13]2[CH2:15][C@H:10]1[CH2:11][NH:12]2.C(=O)([O-])[O-].[K+].[K+]>O1CCCC1.C(Cl)Cl>[CH3:8][N:9]1[CH2:14][C@@H:13]2[CH2:15][C@H:10]1[CH2:11][N:12]2[C:2]1[S:6][N:5]=[C:4]([CH3:7])[N:3]=1
A solution of 1.04 g of 5-chloro-3-methyl-1,2,4-thiadiazole, prepared by the procedure of J. Goerdeler, Chim. Ber., 1957, 90, 182, in 2 ml of tetrahydrofuran is added over one hour to a solution of 0.825 g of (S,S)-2-methyl-2,5-diazabicyclo[2.2.1]heptane and 0.77 g of potassium carbonate in 10 ml of tetrahydrofuran. The reaction mixture is stirred at room temperature overnight, diluted with methylene chloride and the organic layer is washed with water. The methylene chloride solution is dried and concentrated in vacuo to dryness. The residue is purified by chromatography (aluminum oxide, Activity Grade 2.5: 2% methyl alcohol/methylene chloride) to give 0.56 g of the desired product:
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