[CH2:1]([O:3][C:4]([C:6]1[N:7]=[C:8]([S:14][CH3:15])[S:9][C:10]=1[C:11](Cl)=[O:12])=[O:5])[CH3:2].[C:16]([NH2:20])([CH3:19])([CH3:18])[CH3:17].Cl>ClCCl>[C:16]([NH:20][C:11]([C:10]1[S:9][C:8]([S:14][CH3:15])=[N:7][C:6]=1[C:4]([O:3][CH2:1][CH3:2])=[O:5])=[O:12])([CH3:19])([CH3:18])[CH3:17]3.50 g (13.2 mmol) of 4-ethoxycarbonyl-2-methylthiothiazole-5-carboxylic acid chloride was dissolved in 20 ml of dichloromethane and dripped, at 0° C., into a solution of 3.20 g (44 mmol) of tert-butylamine in 50 ml of dichloromethane. The mixture was allowed to warm up to room temperature and was then stirred for 14 hours. 100 ml of 10% strength hydrochloric acid was added and the organic phase was separated, washed with 50 ml of water and dried over sodium sulfate. The solvent was removed under reduced pressure, leaving 4.00 g (100%) of product as a yellow crystalline slurry.
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