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.
本发明涉及一种制备式I的异氧唑的方法,其中置换基如下所定义:R1为氢、C1-C6烷基,R2为C1-C6烷基,R3、R4、R5为氢、C1-C6烷基,或R4和R5一起形成键,R6为杂环,n为0、1或2。该方法包括制备式VI的中间体,其中R1、R3、R4和R5如上所定义,然后进行卤代、
硫甲基化、氧化和酰化,以得到式I的化合物。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方法。