[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[N:9]=[C:10]=[S:11].C1COCC1.[NH2:17][C@@H:18]1[CH2:23][CH2:22][CH2:21][CH2:20][C@H:19]1[NH2:24].Cl>O>[NH2:17][CH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][CH:19]1[NH:24][C:10]([NH:9][C:3]1[C:2]([Cl:1])=[CH:7][CH:6]=[CH:5][C:4]=1[Cl:8])=[S:11]A solution of 1,3-dichloro-2-isothiocyanatobenzene (100 mg) and abs. THF (3 ml) was added dropwise slowly over a half hour to a solution of trans-1,2-diaminocyclohexane (139.9 mg) and abs. THF (3 ml). The solution was stirred at room temperature for a further 90 minutes. The reaction mixture was subsequently added to water, acidified with hydrochloric acid and extracted once with ethyl acetate. Afterwards, the mixture was basified using potassium carbonate, and extracted three times with ethyl acetate. The combined organic phases were dried over magnesium sulfate, filtered and concentrated. 128 mg of the desired product were obtained.
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