A process for preparing 4-haloalkylnicotinamides of the formula (I)
where
R
1
is (C
1
-C
4
-haloalkyl, which comprises subjecting
one or more 3-((C
1
-C
4
)-haloalkyl-3-oxo-1-alkenylamino)nitriles of the formula (II), (III) and/or (IV)
R
1
—C(O)—CH=CH—NH—CH=CH—CN (II)
R
1
—C(O)—CH=CH—NH—CH(ZR
2
)—CH
2
—CN (III)
R
1
—C(O)—CH=CH—NH—CH(Hal)—CH
2
—CN (IV)
where
R
1
is as defined above;
R
2
is the same or different and is (C
1
-C
6
)-alkyl and
Z is the same or different and is O, S or NR
1
, to a ring-closing reaction and simultaneous hydrolysis in the presence of a strong acid. The compounds of the formula (I) are useful as intermediates for preparing pesticides.
一种制备式 (I) 的 4-卤代烷基烟酰胺的工艺
式中
R
1
是(C
1
-C
4
-卤代烷基,其中包括将
一个或多个 3-((C
1
-C
4
)-卤代烷基-3-氧代-1-烯基
氨基)
硝酸酯,其式为(II)、(III)和/或(IV)
R
1
-C(O)-CH=CH-NH-CH=CH-CN (II)
R
1
-C(O)-CH=CH-NH-CH(ZR
2
)-CH
2
-CN(III)
R
1
-C(O)-CH=CH-NH-CH(Hal)-CH
2
-CN(IV)
其中
R
1
如上定义;
R
2
相同或不同,并且是(C
1
-C
6
烷基,且
Z 相同或不同,并且是 O、S 或 NR
1
,在强酸存在下发生闭环反应并同时
水解。式(I)化合物可用作制备
杀虫剂的中间体。