[NH2:1][C:2]1[S:3][C:4]2[CH:10]=[CH:9][CH:8]=[C:7]([O:11][CH3:12])[C:5]=2[N:6]=1.N1C=CC=CC=1.Cl[C:20]([O:22][CH3:23])=[O:21].Cl>ClCCl>[CH3:23][O:22][C:20](=[O:21])[NH:1][C:2]1[S:3][C:4]2[CH:10]=[CH:9][CH:8]=[C:7]([O:11][CH3:12])[C:5]=2[N:6]=1To a stirred solution of 23.6 g (131 mmol) 2-amino-4-methoxybenzothiazole and 12.6 ml (157 mmol) pyridine in 230 ml dichloromethane at 0° C. was added dropwise 10.6 ml (137 mmol) methyl chloroformate and stirring continued for 1 hour. The mixture was then poured onto 1 M hydrochloric acid and the organic phase was separated, washed with brine, dried over sodium sulfate, and concentrated in vacuo to afford 31.0 g (99%) (4-methoxy-benzothiazol-2-yl)-carbamic acid methyl ester as a white solid. ES-MS m/e (%): 239 (M+H+, 100).
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