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An efficient and facile method for the synthesis of 3-indolyl-substituted phthalides by Friedel-Crafts alkylation of indoles with 3-hydroxyisobenzofuran-1(3H)-one has been developed. Using only 2 mol-% TsOH·H2O as the catalyst, various substituted indoles can react smoothly at room temperature to give the corresponding phthalides products in good to excellent yields (up to 96%).

modern research in catalysis

TsOH&amp;#183;H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O-Catalyzed Friedel-Crafts of Indoles of 3-Hydroxyisobenzofuran-1(3&amp;lt;i&amp;gt;H&amp;lt;/i&amp;gt;)-One with Indoles: Highly Synthesis of 3-Indolyl-Substituted Phthalides