isoxazoline heterocycles that have similar structural features to the commercially used phenylpyrazole, fipronil. Synthesis of the appropriately substituted styrenes and phenylacetylenes is followed by 1,3-dipolar cycloaddition reaction with several aliphatic nitrile oxides, which are prepared in situ from aldoximes with bleach. Relative reaction rates were determined for these specialized alkene and
Alkyl aldoximes without a directing group undergo palladium-catalyzed C–H arylation with arylbromides to afford alkylaryl ketoximes in moderate to high yields. The reaction of electron-rich arylbromides and linear oximes proceeded to afford the coupling products in up to 98% yield. This reaction has broad scope and excellent functional group tolerance. Although reactions using hydroxyl oximes as
The reaction of isocyanates and oximes undergoes N-selective carbamoylation, directly generating nitrones. Sequential reactions with dipolarophiles give isoxazolidines. The combination of the three components provides diversity in the yields of isoxazolidines.