Direct C–H arylation and alkenylation of 4,4′-dialkylimidazolones with a broad range of halides under palladium and copper catalysis have been developed.
Highly efficient methods for the syntheses of spiroimidazolinones via microwave-assisted three-componentone-potsequentialreactions or one-potdominoreactions are described. The efficiency and utility of the methods have been demonstrated by quickly accessing the antihypertensive drug irbesartan (2).
Base-mediated ringclosure of α,α-disubstituted α-isocyanoamides with further electrophilic trapping has previously been explored, but with limited applications. In this work, we wished to unravel the reactivities of these compounds and, in particular, to allow palladium-catalyzed coupling at the C2 position.