申请人:Ciba-Geigy Corporation
公开号:US05344992A1
公开(公告)日:1994-09-06
There is disclosed a process for the preparation of 1,3-diketones of formula I ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 -C.sub.20 alkyl, phenyl or phenyl which is substituted by halogen, hydroxy, NO.sub.2, C.sub.1 -C.sub.4 alkyl and/or C.sub.1 -C.sub.4 alkoxy, C.sub.7 -C.sub.9 phenylalkyl or a radical of formula II --A--X--R.sub.4 (II) wherein A is C.sub.1 -C.sub.12 alkylene, phenylene or phenylene which is substituted by halogen, hydroxy, NO.sub.2, C.sub.1 -C.sub.4 alkyl and/or C.sub.1 -C.sub.4 alkoxy, or is C.sub.1 -C.sub.12 alkylene which is substituted by hydroxy, halogen and/or alkoxy, X is oxygen or sulfur, and R.sub.4 is hydrogen, C.sub.1 -C.sub.18 alkyl, phenyl or phenyl which is substituted by halogen, hydroxy, C.sub.1 -C.sub.4 alkyl, NO.sub.2 and/or C.sub.1 -C.sub.4 alkoxy, or is C.sub.7 -C.sub.9 phenylalkyl, and R.sub.3 is hydrogen, C.sub.1 -C.sub.20 alkyl, phenyl or phenyl which is substituted by halogen, hydroxy, C.sub.1 -C.sub.4 alkyl, NO.sub.2 and/or C.sub.1 -C.sub.4 alkoxy, or is C.sub.7 -C.sub.9 phenylalkyl. The process comprises carrying out a Claisen condensation of a ketone of formula III ##STR2## and an ester of formula IV ##STR3## wherein R.sub.5 is C.sub.1 -C.sub.5 alkyl, phenyl or phenyl which is substituted by halogen, C.sub.1 -C.sub.4 alkyl or hydroxy, the reaction being carried out with the base used as catalyst, a hydride of an alkali metal or alkaline earth metal or an alcoholate of C.sub.1 -C.sub.5 alkali metal or C.sub.1 -C.sub.5 alkaline earth metal, in a mixture of dimethyl sulfoxide and at least one organic solvent which is inert under the reaction conditions.
揭示了一种制备式I的1,3-二酮的方法##STR1##其中R.sub.1和R.sub.2分别独立于另一个是C.sub.1-C.sub.20烷基,苯基或被卤素,羟基,NO.sub.2,C.sub.1-C.sub.4烷基和/或C.sub.1-C.sub.4烷氧基取代的苯基,C.sub.7-C.sub.9苯基烷基或式II的基团--A--X--R.sub.4(II)其中A是C.sub.1-C.sub.12烷基,苯基或被卤素,羟基,NO.sub.2,C.sub.1-C.sub.4烷基和/或C.sub.1-C.sub.4烷氧基取代的苯基,或是被羟基,卤素和/或烷氧基取代的C.sub.1-C.sub.12烷基,X是氧或硫,R.sub.4是氢,C.sub.1-C.sub.18烷基,苯基或被卤素,羟基,C.sub.1-C.sub.4烷基,NO.sub.2和/或C.sub.1-C.sub.4烷氧基取代的苯基,或是C.sub.7-C.sub.9苯基烷基,R.sub.3是氢,C.sub.1-C.sub.20烷基,苯基或被卤素,羟基,C.sub.1-C.sub.4烷基,NO.sub.2和/或C.sub.1-C.sub.4烷氧基取代的苯基,或是C.sub.7-C.sub.9苯基烷基。该方法包括在二甲基亚砜和至少一种在反应条件下惰性的有机溶剂的混合物中,以碱金属或碱土金属的氢化物或C.sub.1-C.sub.5碱金属或C.sub.1-C.sub.5碱土金属的醇酸盐作为催化剂,进行式III的酮##STR2##和式IV的酯##STR3##的Claisen缩合反应,其中R.sub.5是C.sub.1-C.sub.5烷基,苯基或被卤素,C.sub.1-C.sub.4烷基或羟基取代的苯基。