The first highly diastereo- and enantioselective multicomponent reaction of diazooxindoles, nitrosoarenes, and nitroalkenes using a newly developed hydrogen-bond catalyst has been successfully developed for the efficient construction of a series of spirooxindole derivatives with excellent functional-group tolerance. Spirooxindoles are formed in excellent yields and stereoselectivities, and the method represents an unprecedented approach for trapping the active intermediate with a nitroalkene to form biologically important compounds having three contiguous stereogenic centers with excellent asymmetric induction.
Keywords: diazo compounds; enantioselectivity; heterocycles; multicomponent reactions; organocatalysis.
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.