Abstract
A highly efficient catalyst‐free1,3‐dipolar cycloaddition reaction of methyleneindolinones and C,N‐cyclic azomethine imines was realized. The reactions afforded a large variety of spirooxindoles in high yields (up to 99%) and excellent diastereoselectivities (dr > 20:1). Furthermore, the configuration of one of the products was determined on the basis of X‐ray structural analysis. Accordingly, a possible transition‐state model was proposed.
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