反应详情

0.7 g of 50% sodium hydride in an oil was added in small portions to a mixture of 2.5 g of pyrazole and 20 ml of dimethylformamide, and the resulting mixture was stirred for 30 minutes. 2.5 g of 6-methylergolin-8β-ylmethyl tosylate was added to the mixture which was then heated on a water bath for 1 hour. The solvent was distilled off under reduced pressure, and water was added to the residue. The precipitated crystals were separated by filtration, washed with water and recrystallized from dichloromethane-isopropyl ether to obtain 1.7 g of the titled compound as colorless flakes having a melting point of 192°-194° C.

1. temperaturewas then heated on a water bath for 1 hour
2. distillationThe solvent was distilled off under reduced pressure, and water
3. additionwas added to the residue
4. customThe precipitated crystals were separated by filtration
5. washwashed with water
6. customrecrystallized from dichloromethane-isopropyl ether