1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → N2-(2-cyclopropylamino-4,5-difluorobenzoyl)hydrazinecarboxylic acid tert-butyl ester

関与物質

反応手順

To a solution of 2-cyclopropylamino-4,5-difluorobenzoic acid (Example 5) (1.32 g, 6.19 mmol) and tert-butyl carbazate (1.30 g, 9.75 mmol) in dichloromethane (30 mL) is added 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (1.87 g, 9.75 mmol). After 16 hours, the reaction mixture is diluted with dichloromethane and washed with saturated NaHCO3, water, and brine. The organic layer is dried over MgSO4 and filtered. The filtrate is concentrated under vacuum and purified via flash column chromatography (1:2 ethyl acetate/hexanes) to afford N2-(2-cyclopropylamino-4,5-difluorobenzoyl)hydrazinecarboxylic acid tert-butyl ester as a solid (1.65 g). MS EI: m/z 328 (M+).

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