The invention relates to compounds represented by general formula (I), [wherein R1 represents a hydrogen atom, a lower alkyl group or an aryl group, R2 represents a lower alkyl group, a group represented by -Xr (wherein X represents an oxygen atom or Nr1, r represents a lower alkyl group or an aryl group, and r' represents a hydrogen atom or a lower alkyl group) or an aryl group, provided that R1 and -COR2 may be combined together to form a ring] and a process for their preparation. The compounds are useful as starting materials for agrochemicals and medicines, porphyrins, dyes, etc.
本发明涉及通式(I)代表的化合物[其中 R1 代表氢原子、低级烷基或芳基,R2 代表低级烷基、由 -Xr 代表的基团(其中 X 代表氧原子或 Nr1,r 代表低级烷基或芳基,r'代表氢原子或低级烷基)或芳基,条件是 R1 和 -COR2 可以结合在一起形成一个环]及其制备方法。这些化合物可用作农用
化学品和药物、
卟啉、
染料等的起始原料。