申请人:Bayer Aktiengesellschaft
公开号:US04703122A1
公开(公告)日:1987-10-27
The invention relates to a new process for preparing O-pyrimidinyl N,N-dimethylcarbamates of the formula (I) ##STR1## in which R stands for straight-chain or branched alkyl, R.sup.1 stands for hydrogen or optionally substituted radicals from the series alkyl, alkoxy, alkylthio, alkylsulphinyl or alkylsulphonyl, R.sup.2 stands for hydrogen or optionally substituted alkyl or R.sup.1 and R.sup.2 together can form a fused-on optionally substituted saturated or unsaturated ring, A stands for straight-chain or branched alkylene and n stands for 0, 1 or 2. Components of the above formula (I) are obtained when hydroxypyrimidines of the formula (II) ##STR2## in which R, R.sup.1, R.sup.2, A and n have the above mentioned meanings, are reacted with N,N-dimethylcarbamoyl halides of the formula (III) Hal--CO--N(CH.sub.3).sub.2 (III) in which Hal stands for chlorine or bromine, at temperatures between 0.degree. C. and 150.degree. C. and in particular between 20.degree. C. and 100.degree. C. in the presence of a catalytic amounts of a bicyclic organic amine, in the presence of acid acceptors and in the presence of a diluent. The bicyclic organic amines are preferably 1,4-diazabicyclo(2,2,2)-octane (DABCO) and quinuclidine, DABCO being particularly preferable. The O-pyrimidinyl N,N-dimethylcarbamates of formula (I) are highly active insecticides.
本发明涉及一种制备式(I)的O-嘧啶基N,N-二甲基氨基甲酸酯的新工艺,其中R代表直链或支链烷基,R.sup.1代表氢或选用自系列烷基,烷氧基,烷基硫醇基,烷基亚磺酰基或烷基磺酰基的取代基,R.sup.2代表氢或选用的取代烷基,或R.sup.1和R.sup.2可以共同形成一个螺合的、可选地取代的饱和或不饱和环,A代表直链或支链亚烷基,n代表0、1或2。当式(II)的羟基嘧啶与式(III)Hal-CO-N(CH.sub.3).sub.2 (III)中Hal代表氯或溴的N,N-二甲基氨基甲酰卤化物在0℃至150℃之间(特别是在20℃至100℃之间)在催化量的双环有机胺、酸性受体和稀释剂的存在下反应时,可以得到上述式(I)的组分,其中双环有机胺优选为1,4-二氮杂双环(2,2,2)-辛烷(DABCO)和喹诺啉,其中DABCO特别优选。式(I)的O-嘧啶基N,N-二甲基氨基甲酸酯是高活性杀虫剂。