Controllable Synthesis of N - and O -Containing Heterocycles via Formal [3 + 2] and [5 + 2] Cyclizations.

The controllable synthesis of spirooxindole-dihydrofurans and spirooxindole-benzazepines was developed through formal [3 + 2] and [5 + 2] cyclization reactions from 2-(2-oxoindolin-3-yl)malononitriles and ortho -aminobenzaldehydes, respectively. A variety of spirooxindole-benzazepines were facilely constructed via a furan ring-open-involved hydride transfer/cyclization process. It is noteworthy that the application of the hydride-transfer-involved [5 + 2] cyclization strategy for construction of spirobenzazepines was unprecedented. In addition, the spiro N - and O -containing heterocycles were highly functionalized by amino, amide, and cyano groups, which were conducive to late-stage functionalization.