反応 #816573

反応方程式

2-(2,4-difluoroanilino)-4,5-difluorobenzoic acid

tert-butyl carbazate

1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide

→

[2-(2,4-difluoroanilino)-4,5-difluorobenzoyl]-hydrazinecarboxylic acid tert-butyl ester

収率 72.5%

溶媒

dichloromethane

dichloromethane

反応条件

後処理

1. 1
   洗浄washed with saturated NaHCO3, water, and brine
2. 2
   乾燥The organic layer is dried over Na2SO4
3. 3
   濃縮concentrated under vacuum
4. 4
   その他purified via column chromatography (1:3 ethyl acetate/hexanes)

実験手順

To a solution of 2-(2,4-difluoroanilino)-4,5-difluorobenzoic acid (Example 5, 2.18 g, 7.6 mmol) and tert-butyl carbazate (1.57 g, 11.8 mmol) in dichloromethane (30 mL) is added 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (2.25 g, 11.77 mmol). After stirring for 16 hours at room temperature, the reaction mixture is diluted with dichloromethane and then washed with saturated NaHCO3, water, and brine. The organic layer is dried over Na2SO4, concentrated under vacuum, and purified via column chromatography (1:3 ethyl acetate/hexanes) to afford [2-(2,4-difluoroanilino)-4,5-difluorobenzoyl]-hydrazinecarboxylic acid tert-butyl ester as a solid (2.20 g). MS EI: m/z 400 (M+).

出典