P(NMe2)3-mediated reductive [1+4] annulation of isatins with enones: a facile synthesis of spirooxindole-dihydrofurans†
Abstract
A novel P(NMe2)3-mediated reductive [1+4] annulation reaction between isatins and enones has been developed, providing the facile synthesis of spirooxindole-dihydrofurans. This reaction unveils the first practical approach to construct five-membered cyclic motifs via a Kukhtin–Ramirez adduct involved [1+4] annulation mode.