An enantioselective domino Michael–Michael
reaction of nitroolefins
and 2-nitro-3-arylacrylates has been established, which provided a
series of spirocyclopentane oxindoles with four consecutive stereocenters
including quaternary α-nitro esters with good yields (up to
73%) and excellent enantioselectivities (up to 97% ee). The reaction
was realized and optimized with the aid of a chiral squaramide-amine
catalyst. The structures of 11 products were confirmed by single-crystal
X-ray diffraction analysis.
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.