A useful method for the enantioselective preparation of isoxazoline N-oxides via Pd-catalyzed asymmetric allylic cycloaddition of nitro-containing allylic carbonates has been developed. By using palladium complex in situ generated from Pd 2 (dba) 3 •CHCl 3 and phosphoramidite L2 as a catalyst under mild conditions, the transformation afforded vinylated isoxazoline N-oxides in high yields with acceptably high enantioselectivities.
An efficient method for the enantioselective synthesis of cyclic ureas has been developed through Pd-catalyzed asymmetric allylic cycloaddition of readily accessible nitrogen-containing allylic carbonates with isocyanates. By using a palladium complex in situ generated from Pd 2 (dba) 3 •CHCl 3 and phosphoramidite L1 or L3 as a ligand under mild reaction conditions, the process afforded imidazolidinones and tetrahydropyrimidinones with high yields and high levels of enantioselectivities.
An efficient method for the enantio‐ and diastereoselective formation of furanochromanones has been developed via Pd‐catalyzed asymmetric allylic cycloaddition of vinylethylene carbonates with 3‐nitrochromone. By using a palladium complex generated in situ from [Pd2(dba)3]⋅CHCl3 and phosphoramidite L4 as a catalyst, the transformation allows to rapid access furanochromanones bearing versatile nitro‐group and multi‐stereocenters in high yields with excellent enantioselectivities and moderate diastereoselectivities.
An efficient method for the asymmetric synthesis of N-substituted 2-pyridones via a Pd-catalyzed regio- and enantioselective allylic substitution of hydroxyl-containing allylic carbonates with 2-pyridones has been developed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.