申请人:Lonza Ltd.
公开号:US05304663A1
公开(公告)日:1994-04-19
A novel process for the preparation of pentaalkylchromenes of the general formula: ##STR1## wherein R denotes a lower alkyl group having 1 to 4 C atoms and R.sub.1 denotes a phenyl group which is unsubstituted or substituted by a lower alkyl group having 1 to 4 C atoms, by halogen or by a nitro group, or an alkanoyl group having 1 to 4 C atoms. In the process, a trialkylhydroquinone is reacted with a halogenated butenol to give a substituted tetraalkyhydroquinone, which is oxidized. Then the halogen atom is substituted with a suitable nucleophile and the compound is finally cyclized to give the final product. The pentaalkylchromenes are suitable intermediates for the preparation of hypolipidaemic pharmaceuticals.
一种制备通式为:##STR1##的五烷基基色苷的新工艺,其中R表示具有1至4个碳原子的低烷基基团,R.sub.1表示未取代或经1至4个碳原子的低烷基基团、卤素或硝基基团或具有1至4个碳原子的脂肪酰基基团取代的苯基团。在该工艺中,三烷基对苯二醌与卤代丁烯醇反应得到取代的四烷基对苯二醌,随后进行氧化。然后,卤素原子被适当的亲核试剂取代,最终化合物环化形成最终产物。这些五烷基基色苷是制备降血脂药物的合适中间体。