申请人:——
公开号:US20020156290A1
公开(公告)日:2002-10-24
A novel process for preparing the compounds of the formula I
1
where:
n is 0, 1 or 2;
R
1
,R
2
are C
1
-C
6
-alkyl;
R
3
,R
4
,R
5
are hydrogen or C
1
-C
6
-alkyl, or R
4
and R
5
together form a bond;
R
6
is Cl, Br,
which comprises a synthesis sequence starting from 1,2-dialkylbenzenes of the formula II
2
with subsequent halogenation to give 3,6-dihalo-1,2-dialkylbenzenes, haloalkylation to give benzyl bromides, oxidation to give benzaldehydes, oximation, reaction 40 with alkenes to give isoxazoles, conversion into thioethers and, if appropriate, oxidation to give sulfenyl or sulfonyl derivatives of the formula I.
一种用于制备化合物I1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,或者R4和R5共同形成键;R6为Cl、Br,包括从式II2的1,2-二烷基苯开始的合成序列,随后进行卤代反应得到3,6-二卤代-1,2-二烷基苯,卤代烷基化得到苄溴化物,氧化得到苯甲醛,氧化反应生成异噁唑烷,转化为硫醚,如有必要,氧化得到式I的砜基或磺酰基衍生物。