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Homoallylic alcohols, carbonyl compounds and nitriles undergo a smooth tandem Prins–Ritter type cyclization in the presence of CeCl 3 ·7H 2 O/AcCl at ambient temperature to produce 4-amido tetrahydropyrans in high yields with all cis-selectivity. Spirocyclic 4-amido tetrahydropyrans are obtained in the case of cyclic ketones.
3-Alkylindoles undergo smooth oxidation with IBX in the presence of CeCl 3 ·7H 2 O in aqueous acetonitrile at ambient temperature to afford the corresponding 3-hydroxyoxindoles in high yields. This method is very useful for the direct preparation of 3-hydroxyoxindoles from 3-alkylindoles. Operational simplicity, mild and neutral reaction conditions in aqueous solution are the key features...
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