H-β Zeolite: an Efficient, Reusable Catalyst for One-Pot Synthesis of Isatins from Anilines.

We describe a simple and highly efficient procedure for the single-step preparation of isatins from the commercially available anilines using H-β zeolite as a truly heterogeneous catalyst. H-β zeolite is readily separated from reaction mixture by simple filtration and reused several times without considerable loss of activity.