The palladiumcatalyzed one-pot synthesis of isoxazoles and pyrazoles from aryl iodides, terminal alkynes, chromium hexacarbonyl and hydroxylamine hydrochloride or aqueous hydrazine solution is described. The Sonogashira carbonylative coupling intermediate was trapped in situ by hydroxylamine hydrochloride or aqueous hydrazine to deliver isoxazoles or pyrazoles, respectively, in high yields. This efficient
Thienyl-pyrazoles and their use for controlling pests
申请人:Wada Katsuaki
公开号:US20050048092A1
公开(公告)日:2005-03-03
The present invention relates to compounds of the formulae (Ia) and (Ib)
wherein
R
1
represents C
1-10
alkyl which may be unsubstituted or substituted with halogen, or represents C
2-4
alkoxyalkyl, C
2-4
hydroxyalkyl, C
3-6
cycloalkyl, hydroxy, C
1-9
alkoxy which may be unsubstituted or substituted with halogen, or represents C
3-6
cycloalkoxy, C
2-4
alkoxyalkoxy or C
3-4
alkynyloxy, and
R
2
represents hydrogen, C
1-4
alkoxycarbonyl, C
1-3
alkylcarbonyl or C
2-4
alkoxyalkyl, to processes for their preparation and to their use for controlling animal pests.