Ligand-controlled stereodivergent 1,3-dipolar cycloaddition of azomethine ylides with 3-methyl-4-nitro-5-styrylisoxazoles

Chem Commun (Camb). 2016 Aug 4;52(60):9458-61. doi: 10.1039/c6cc03169b. Epub 2016 Jul 5.

Abstract

An unprecedented Ag(i)-catalyzed ligand-controlled stereodivergent 1,3-dipolar cycloaddition of azomethine ylides with 3-methyl-4-nitro-5-styrylisoxazoles has been developed to afford heterocycles bearing both methylisoxazole and pyrrolidine moieties. The endo- and exo-cycloadducts were obtained in good yields with excellent stereoselectivities, assisted by (t)Bu-Phosferrox and phosphoramidite as chiral ligands, respectively.