[N+:1]([C:4]1[CH:13]=[CH:12][C:7]2[NH:8][C:9](=[O:11])[S:10][C:6]=2[CH:5]=1)([O-:3])=[O:2].N12CCCN=C1CC[CH2:17][CH2:16][CH2:15]2.IC(C)C>CN(C)C=O.O>[N+:1]([C:4]1[CH:13]=[CH:12][C:7]2[N:8]([CH:16]([CH3:17])[CH3:15])[C:9](=[O:11])[S:10][C:6]=2[CH:5]=1)([O-:3])=[O:2]A stirred solution of 6-nitro-2-benzothiazolinone (5.0 g, 25.5 mmol) in anhydrous N,N-dimethylformamide (51 mL) under N2 is treated with 1,8-diazabicyclo[5.4.0]undec-7-ene (4.96 mL, 33.1 mmol) dropwise. Following a slight exotherm, the reaction mixture is heated up to 50° C. and treated with 2-iodopropane (12.7 mL, 127 mmol). The resulting mixture is quickly heated up to 75° C., stirred at this temperature for 40 mins, cooled to ambient temperature and diluted with ice (100 mL) and water (100 mL). The precipitate is isolated by filtration and recrystallized from ethyl acetate/hexanes to give the title compound, mp 138–142° C.
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