J. G. Lei, R. Hong, S. G. Yuan, G. Q. Lin, “Nickel-Catalyzed Tandem. Reaction to Asymmetric Synthesis of Chiral Phthalides,” Synlett, No. 6, 2002, pp. 927-930.
has been cited by the following article:
TITLE: TsOH·H2O-Catalyzed Friedel-Crafts of Indoles of 3-Hydroxyisobenzofuran-1(3H)-One with Indoles: Highly Synthesis of 3-Indolyl-Substituted Phthalides
AUTHORS: Hongying Tang, Xinyu Zhang, Airu Song, Zhongbiao Zhang
KEYWORDS: Synthesis; 3-Indolyl-Substituted Phthalides; Friedel-Crafts Alkylation; 3-Hydroxyisobenzofuran-1(3H)-One; Indole
JOURNAL NAME: Modern Research in Catalysis, Vol.1 No.2, July 24, 2012
ABSTRACT: 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%).