A process for preparing new compounds which are N- and O-acylates of pyrazofurin comprises first selective mono-N-acylation under non-basic conditions in an organic solvent. The mono-N-acylate so formed is further acylated under mild basic conditions to provide a tetra-acylated or penta-acylated pyrazofurin derivative, depending upon the duration of reaction. Mild solvolysis of either a tetra-acylate or a penta-acylate provides a tri-acylated pyrazofurin derivative. In the presence of a strong base, the mono-N-acylate is further acylated to provide different tetra-acylates or penta-acylates of pyrazofurin, again depending upon the duration of reaction. Pyrazofurin acylates are useful as antiviral, antipsoriatic, and antifungal agents, as well as intermediates for new C-nucleosides.
一种制备新化合物的方法,这些化合物是
吡唑呋喃的N-和O-酰化物,首先在有机溶剂中在非碱性条件下进行选择性的单N-酰化。所形成的单N-酰化物在温和的碱性条件下进一步酰化,以提供四酰化或五酰化的
吡唑呋喃衍
生物,取决于反应的持续时间。对四酰化或五酰化物进行温和的溶解作用,可提供三酰化的
吡唑呋喃衍
生物。在强碱存在下,单N-酰化物进一步酰化,以提供不同的四酰化或五酰化的
吡唑呋喃,同样取决于反应的持续时间。
吡唑呋喃酰化物可用作抗病毒、抗
银屑病和抗真菌剂,以及新C-核苷的中间体。