2026-05-27T04:00:39Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/38952022-12-19T09:36:20Zcom_10259_3593com_10259_5086com_10259_2604col_10259_3594

Sanjuán Cortázar, Ana María Rashid, Muhammad A. García García, Patricia Martínez Cuezva, Alberto Fernández Rodríguez, Manuel A. Rodríguez, Félix Sanz Díez, Roberto 2015-02 Indenes and related polycyclic structures have been efficiently synthesized by gold(I)-catalyzed cycloisomerizations of appropriate ortho-(alkynyl)styrenes. Disubstitution at the terminal position of the olefin was demonstrated to be essential to obtain products originating from a formal 5-endo-dig cyclization. Interestingly, a complete switch in the selectivity of the cyclization of o-(alkynyl)-α-methylstyrenes from 6-endo to 5-endo was observed by adding an alcohol to the reaction media. This allowed the synthesis of interesting indenes bearing an all-carbon quaternary center at C1. Moreover, dihydrobenzo[a]fluorenes can be obtained from substrates bearing a secondary alkyl group at the β-position of the styrene moiety by a tandem cycloisomerization/1,2-hydride migration process. In addition, diverse polycyclic compounds were obtained by an intramolecular gold-catalyzed alkoxycyclization of o-(alkynyl)styrenes bearing a nucleophile in their structure. Finally, the use of a chiral gold complex allowed access to elusive chiral 1H-indenes in good enantioselectivities application/pdf http://hdl.handle.net/10259/3895 eng Wiley-VCH Verlag Gold(I)-Catalyzed Cycloisomerizations and Alkoxycyclizations of ortho-(Alkynyl)styrenes info:eu-repo/semantics/article TEXT RIUBU. Repositorio Institucional de la Universidad de Burgos Hispana