反应详情

温度

0 °C

DMF (a catalytic amount) was added to a thionyl chloride (15 ml) solution of 1-(3-chloro-4-methyl-2-thienyl)cyclopentanecarboxylic acid (1.59 g), followed by stirring at 75° C. for 30 minutes. The reaction solution was subjected to evaporation under reduced pressure to obtain 1-(3-chloro-4-methyl-2-thienyl)cyclopentanecarbonyl chloride. A THF (20 ml) solution of 1-(3-chloro-4-methyl-2-thienyl)cyclopentanecarbonyl chloride was added dropwise to a THF (20 ml) solution of hydrazine monohydrate (12.6 ml) at 0° C., followed by stirring at 0° C. for 3 hours. After the reaction solution and chloroform were added to a saturated aqueous sodium hydrogen carbonate solution, the organic layer was separated. The organic layer washed with brine and, after drying over anhydrous sodium sulfate and filtration, the solvent was removed by evaporation under reduced pressure to obtain 1.65 g of 1-(3-chloro-4-methyl-2-thienyl)cyclopentanecarbohydrazide (pale yellow solid).

1. customthe organic layer was separated
2. washThe organic layer washed with brine
3. dry with materialafter drying over anhydrous sodium sulfate and filtration
4. customthe solvent was removed by evaporation under reduced pressure