title: Efficient synthesis of spironaphthopyrano [2,3-d]pyrimidine-5,3'-indolines under solvent-free conditions catalyzed by SBA-Pr-SO3H as a nanoporous acid catalyst.
abstract: A green, simple one-pot synthesis of spironaphthopyrano[2,3-d]pyrimidine-5,3'-indoline derivatives by a three-component reaction of isatins, 2-naphthol, and barbituric acids under solvent-free conditions in the presence of SBA-Pr-SO(3)H has been accomplished. Sulfonic acid functionalized SBA-15 (SBA-Pr-SO(3)H) as a heterogeneous nanoporous solid acid catalyst was found to be an efficient and recyclable acid catalyst in this synthesis.
authors.forename: Ghodsi Mohammadi
authors.initials: GM
authors.lastname: Ziarani
authors.forename: Negar
authors.initials: N
authors.lastname: Lashgari
authors.forename: Sakineh
authors.initials: S
authors.lastname: Faramarzi
authors.forename: Alireza
authors.initials: A
authors.lastname: Badiei