Abstract
The cyclization of 2-alkynylanilines in the presence of PdCl 2 and nBu 4NCl under an acidic CH 2Cl 2-HCl two-phase system affords 2-substituted indoles in good to high yield, at room temperature. The reaction is particularly suited to the one-flask preparation of 2-substituted indoles from 2-ethynylaniline.
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