Ethyl isothiocyanatoformate → Ethyl {[(5-{3-[(tert-butoxycarbonyl)amino]-4-chlorophenoxy}pyridin-2-yl)amino]carbonothioyl}carbamate

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In the same manner as in Reference Example 30 and using tert-butyl {5-[(6-aminopyridin-3-yl)oxy]-2-chlorophenyl}carbamate (10.8 g, 32.3 mmol), ethyl isothiocyanatoformate (4.60 mL, 38.9 mmol) and DMSO (60 mL) as starting materials, the title compound (14.6 g, 97%) was obtained as a pale-yellow oil.

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