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2015-10-01T11:20:46Z urn:hdl:10259/3866 Straightforward Synthesis of Dihydrobenzo[a]fluorenes through Au(I)-Catalyzed Formal [3 + 3] Cycloadditions García García, Patricia Rashid, Muhammad A. Sanjuán Cortázar, Ana María Fernández Rodríguez, Manuel A. Sanz Díez, Roberto Dihydrobenzo[a]fluorene derivatives have been prepared by a formal intramolecular [3 + 3] cycloaddition of o-alkynylstyrenes bearing a secondary alkyl group at the β-position of the styrene moiety. The process, catalyzed by a cationic gold(I) complex, involves a 1,2-hydride migration as the key step. 6,11-Dihydro-5H-benzo[a]fluorenes could be obtained from the initially generated 6,6a-dihydro-5H-benzo[a]fluorenes by subsequent heating of the reaction mixture under gold(I) or Brønsted acid catalysis or directly by conducting the reactions at high temperature 2015-10-01T11:20:46Z 2015-10-01T11:20:46Z 2012-09 info:eu-repo/semantics/article 1523-7060 http://hdl.handle.net/10259/3866 10.1021/ol3020682 eng Organic Letters. 2012, V. 14, n. 8, p. 4778-4781 http://dx.doi.org/10.1021/ol3020682 info:eu-repo/grantAgreement/MEC/SB2009-0186 info:eu-repo/grantAgreement/FEDER/CTQ2010-15358 info:eu-repo/grantAgreement/FEDER/CTQ2009-09949/BQU info:eu-repo/grantAgreement/JCyL/BU021A09 info:eu-repo/grantAgreement/JCyL/BU021A09 info:eu-repo/grantAgreement/JCyL/GR-172 info:eu-repo/semantics/openAccess American Chemical Society