The present invention describes a process for preparing isoxazoles of the formula I
1
where:
R
1
is hydrogen, C
1
-C
6
-alkyl,
R
2
is hydrogen, C
1
-C
6
-alkyl,
R
3
, R
4
, R
5
are each hydrogen, C
1
-C
6
-alkyl or R
4
and R
5
together form a bond,
R
6
is a heterocyclic ring,
n is 0, 1 or 2;
which comprises preparing an intermediate of the formula VI
2
where R
1
, R
3
, R
4
and R
5
are each as defined above, followed by halogenation, thiomethylation, oxidation and acylation to give compounds of the formula I.
Furthermore, the invention describes novel intermediates for preparing the compounds of the formula I and novel processes for preparing the intermediates.
本发明描述了一种制备式I1异构体的过程,其中:R1为
氢、C1-C6烷基,R2为
氢、C1-C6烷基,R3、R4、R5分别为
氢、C1-C6烷基或R4和R5共同形成键,R6为杂环环,n为0、1或2;该过程包括制备式VI2的
中间体,其中R1、R3、R4和R5均如上所述,随后进行卤代反应、
硫代
甲基化、
氧化和酰化,以得到式I的化合物。此外,本发明还描述了制备式I化合物的新型
中间体和制备
中间体的新型过程。