A process is described for preparing isoxazoles of the formula I
where the substituents are as defined below:
R
1
is hydrogen, C
1
-C
6
-alkyl,
R
2
is C
1
-C
6
-alkyl,
R
3
, R
4
, R
5
are 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
where R1, R3, R4 and R5 are as defined above, followed by halogenation, thiomethylation, oxidation and acylation to give compounds of the formula I.
Also novel intermediates for preparing the compounds of the formula I and novel processes for preparing the intermediates are described.
本发明提供了一种制备公式I中所述取代基为以下定义的
异噁唑的方法:R1为氢、C1-C6烷基,R2为C1-C6烷基,R3、R4、R5为氢、C1-C6烷基,或者R4和R5共同形成一个键,R6为杂环环,n为0、1或2。该方法包括制备公式VI的中间体,其中R1、R3、R4和R5如上所定义,随后进行卤代反应、
硫代甲基化反应、氧化反应和酰化反应,以得到公式I的化合物。同时,本发明还描述了用于制备公式I的新型中间体以及制备中间体的新型方法。