申请人:Syngenta Participations AG
公开号:EP1352890A1
公开(公告)日:2003-10-15
The present invention relates to a process for the preparation of bicyclic 1,3-diketone salts of formula I
wherein R1, R2, R3 and R4 are each independently of the others hydrogen or C1-C4alkyl; A and E are each independently of the other C1-C2alkylene, which may be substituted once or up to four times by a C1-C4alkyl group, and M+ is an alkali metal ion, alkaline earth metal ion or ammonium ion, by oxidation of a compound of formula II
to a compound of formula III
and subsequent conversion to a compound of formula I either in the presence of a base and a catalytic amount of a cyanide or in the presence of an alkali metal alcoholate or alkaline earth metal alcoholate, and to novel bicyclic enol lactone intermediates of formula III for use in that process.
本发明涉及一种制备式I的双环1,3-二酮盐的方法,其中R1、R2、R3和R4各自独立地是氢或C1-C4烷基;A和E各自独立地是C1-C2烷基,可以被C1-C4烷基取代一次或多达四次;M+是碱金属离子、碱土金属离子或铵离子,通过将式II的化合物氧化为式III的化合物,然后在碱和氰化物的催化剂或碱金属醇醚或碱土金属醇醚的存在下将其转化为式I的化合物,以及用于该过程的新型双环烯醇内酯中间体式III。