| 摘要 |
N-[3-(3-Dimethylamino-acryloyl)-phenyl]-N-ethy1-acetamide is reacted with 5-amino-1H-pyrazol-4-carbonitrile in a medium comprising a solution of hydrochloric or hydrobromic acid in a C1-C5 alcohol, or in a C4-C6 aliphatic or cyclic ether, or in a C2-C5 alkoxyalcohol, or in a 5- to 6-membered aromatic heterocyclic solvent, containing 1-2 oxygen atoms, or in mixtures thereof with water, thus forming zaleplon.(I) |
