The invention provides novel processes for preparing efficiently compounds of general formula (1) (wherein R1 and R2 are each independently hydrogen, optionally substituted C1-C10 alkyl, C3-C14 hydrocarbyl bearing alicyclic skeleton, or the like) and initermediates thereof. Compounds of general formula (I) can be prepared by subjecting compounds of general formula (II) and/or salts thereof to cyclization hydrolysis in an aqueous basic solution. Further, compounds of general formula (II) can be prepared from industrially easily available diaminomaleonitrile in a high yield.
本发明提供了一种有效制备一般式(1)化合物(其中R1和R2分别独立地表示氢、可选取代的C1-C10烷基、带有螺环烷基的C3-C14烃基或类似物)及其中间体的新型工艺。通过将一般式(II)化合物和/或其盐在
水性碱性溶液中进行环化
水解,可以制备一般式(I)化合物。此外,可以从工业上易得的
二氨基马来腈高收率地制备一般式(II)化合物。