title: Organocatalytic chemo- and regioselective oxyarylation of styrenes via a cascade reaction: remote activation of hydroxyl groups.
abstract: The first organocatalytic oxyarylation of styrenes has been established through a cascade of vinylogous Michael addition/alkoxyl transfer reactions of o- or p-hydroxylstyrenes with quinone imine ketals. The process leads to a highly chemo- and regioselective oxyarylation of styrenes and provides access to m-alkylated anilines in generally high yields and excellent diastereoselectivity (up to 99% yield, >95:5 dr). An investigation of the reaction pathway revealed that the existence and position of the hydroxyl group of styrene played crucial roles in the cascade reaction, suggesting that the two reactants were simultaneously activated by binaphthyl-derived phosphoric acid via hydrogen bonding interactions and long-distance conjugative effects. In addition, the activating group of the hydroxyl functionality in the products can be easily removed or transformed, demonstrating the applicability and utility of this strategy in styrene oxyarylation and in the synthesis of styrene-based compounds.
authors.affiliation: School of Chemistry and Chemical Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou 221116, China.
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Zhang
authors.forename: Fei
authors.initials: F
authors.lastname: Jiang
authors.forename: Shu-Liang
authors.initials: SL
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Shi
authors.forename: Shu-Jiang
authors.initials: SJ
authors.lastname: Tu
mesh_terms: D002384:Catalysis; D006860:Hydrogen Bonding; D017665:Hydroxyl Radical / Q000737:chemistry*; D015394:Molecular Structure; D009281:Naphthalenes / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D013237:Stereoisomerism; D013343:Styrenes / Q000737:chemistry*
chemical_list: D009281:Naphthalenes; D010756:Phosphoric Acids; D013343:Styrenes; D017665:Hydroxyl Radical; C030242:phosphoric acid