The reaction of benzylic cations with styrenes affords dihydro(1H)indenes in good yield via a formal [3 + 2] atom cycloaddition. The cations were generated from quinone methides and benzylic alcohols. (E)-Styrenes participate in the reaction with remarkable stereoselectivity affording dihydro(1H)indenes with three stereogenic centers with >40:1 diastereoselectivity. A possible transition state for the reaction is discussed. Less activated alkenes such as dihydropyran and methylcyclohexene afforded cycloadducts in 66% and 51% yields, respectively.
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Univ Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, Spain
Garcia-Rubin, Silvia
Varela, Jesus A.
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Univ Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, Spain
Varela, Jesus A.
Castedo, Luis
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Univ Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, Spain
Castedo, Luis
Saa, Carlos
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Univ Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Fac Quim, Dept Quim Organ, Santiago De Compostela 15782, Spain