申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0264234A1
公开(公告)日:1988-04-20
There are disclosed novel benzofurans having the following structural formula:
wherein R is alkenyl of 2 to 6 carbon atoms or unsubstituted or substituted aryl of from 6 to 10 carbon atoms; R₁ is H, alkali metal, or alkyl of 1 to 4 carbon atoms; and R₂ is alkyl or alkoxy of from 1 to 5 carbon atoms, hydrogen, amino or dialkylamino, nitro, sulfo, alkyl or aryl thioether wherein said aryl contains from 6 to 10 carbon atoms, or halo. Also disclosed is a novel process of making the benzofurans, comprising the step of cyclizing a compound of the formula:
wherein R, R₁ and R₂ are as defined above, in the presence of a base selected from the group consisting of KOH, NaOH, LiOH, dimsyl sodium, lithium diisopropylamide, potassium tert-butoxide and mixtures thereof.
These compounds have utility as starting materials in producing acetamidine derivatives useful as anti-hypertensive compounds.
本发明公开了具有以下结构式的新型苯并呋喃:
其中 R 是 2 至 6 个碳原子的烯基或 6 至 10 个碳原子的未取代或取代的芳基;R₁ 是 H、碱金属或 1 至 4 个碳原子的烷基;R₂ 是 1 至 5 个碳原子的烷基或烷氧基、氢、氨基或二烷基氨基、硝基、磺基、烷基或芳基硫醚(其中所述芳基含有 6 至 10 个碳原子)或卤素。本发明还公开了一种制造苯并呋喃的新工艺,包括环化式化合物的步骤:
其中 R、R₁ 和 R₂ 如上文所定义,在选自 KOH、NaOH、LiOH、二甲基钠、二异丙酰胺锂、叔丁醇钾及其混合物组成的碱存在下。
这些化合物可作为生产乙脒衍生物的起始原料,用于生产抗高血压化合物。