反应 #53673
ord-712968c199714d1c9b6993c7f837df5b
反应方程式
反应物
试剂
反应条件
后处理
- 1温度The reaction medium is maintained
- 2浓缩concentrated by evaporation under reduced pressure
- 3其他The residue thus obtained
- 4过滤After filtration
- 5其他the paste obtained
- 6过滤the solid form is filtered through a sintered glass funnel
- 7洗涤washed with two times 50 ml of water
- 8其他dried under reduced pressure
- 9过滤filtered through a sintered glass
- 10过滤filter
- 11洗涤washed with two times 25 ml of ethyl acetate
- 12其他dried at 50° C. under reduced pressure
实验过程
N-Cyclohexyl-5-nitro-1H-indazole-3-carboxamide can be obtained in the following way: a solution of 2.5 g of 5-nitro-1H-indazole-3-carboxylic acid, of 150 ml of dichloromethane, of 75 ml of dimethylformamide, 0.16 g of 1-hydroxybenzotriazole and of 2.75 g 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride is stirred for 15 minutes at a temperature of 25° C. 1.7 ml of cyclohexylamine and 1.7 ml of triethylamine are then added. The reaction medium is maintained with stirring for 70 hours and concentrated by evaporation under reduced pressure. The residue thus obtained is taken up with 50 ml of dichloromethane and 50 ml of diisopropyl ethyl. After filtration, the paste obtained is taken up with 80 ml of distilled water and the solid form is filtered through a sintered glass funnel, washed with two times 50 ml of water and then dried under reduced pressure. The resulting solid is taken up with 50 ml of ethyl acetate, filtered through a sintered glass filter, washed with two times 25 ml of ethyl acetate and dried at 50° C. under reduced pressure. 1.57 g of N-cyclohexyl-5-nitro-1H-indazole-3-carboxamide are thus obtained in the form of a beige solid (Rf=0.90, silica gel thin layer chromatography, eluent: chloroform/methanol/20% aqueous ammonia (12/3/0.5 by volume)).