| 摘要 |
FIELD: heterocyclic compounds. SUBSTANCE: product: heterocyclic derivatives of the formulawhere Ris hydrogen atom, lower alkyl-group, lower alkoxy-group, lower alkylthio-group, halogen atom, nitro-group, amino-group or protected amino-group; Ris hydroxyl-group, protected hydroxyl-group, halogen atom, amino-group or protected amino-group; Ris hydrogen atom or organic group; Ris hydrogen atom or lower alkyl-group; Ris hydrogen atom or lower alkyl-group and the group -O- or the group of the formula:(where n = 0, 1 or 2), and their pharmaceutically acceptable salts which are useful as a medicinal agents. EFFECT: improved method of synthesis. |
