申请人:BASF Aktiengesellschaft
公开号:US06548677B1
公开(公告)日:2003-04-15
A novel process for preparing the compounds of the formula I
where:
n is 0, 1 or 2;
R1, R2 are C1-C6-alkyl;
R3, R4, R5 are hydrogen or C1-C6-alkyl, or R4 and R5 together form a bond;
R6 is Cl, Br,
which comprises a synthesis sequence starting from 1,2-dialkylbenzenes of the formula II
with subsequent halogenation to give 3,6-dihalo-1,2-dialkylbenzenes, haloalkylation to give benzyl bromides, oxidation to give benzaldehydes, oximation, reaction with alkenes to give isoxazoles, conversion into thioethers and, if appropriate, oxidation to give sulfenyl or sulfonyl derivatives of the formula I.
一种制备式I化合物的新工艺,其中:n为0、1或2;R1、R2为C1-C6烷基;R3、R4、R5为氢或C1-C6烷基,或R4和R5共同形成键;R6为Cl、Br。该工艺包括以下合成步骤:从式II的1,2-二烷基苯开始,进行卤代反应得到3,6-二卤-1,2-二烷基苯,进行卤代烷基化反应得到苄溴化物,进行氧化反应得到苯甲醛,进行肟化反应,与烯烃反应得到异噁唑烷,转化为硫醚,如果需要,进行氧化反应得到式I的烷硫基或磺酰基衍生物。