title: Acid-promoted cyclization of 2,4-diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers into CF3-indenes.
abstract: 2,4-Diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers in H2SO4at room temperature in just 2 min are quantitatively cyclized into 1-aryl-3-trifluoromethyl-1H-indenes. The reaction proceeds through an intermediate formation of the corresponding CF3-allyl cations, which are cyclized regioselectively at the allyl carbon atom most remote from the CF3-group. The obtained CF3-indenes in solution of EtOAc in the presence of silica gel at room temperature over 4 h are quantitatively isomerized into 3-aryl-1-trifluoromethyl-1H-indenes.
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg, 199034, Russia.
authors.forename: Matvei Yu
authors.initials: MY
authors.lastname: Martynov
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg, 199034, Russia.
authors.forename: Roman O
authors.initials: RO
authors.lastname: Iakovenko
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg, 199034, Russia.
authors.forename: Anna N
authors.initials: AN
authors.lastname: Kazakova
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg, 199034, Russia.
authors.forename: Irina A
authors.initials: IA
authors.lastname: Boyarskaya
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg, 199034, Russia and Department of Chemistry, Saint Petersburg State Forest Technical University, Institutsky per., 5, Saint Petersburg, 194021, Russia. aleksvasil@mail.ru.
authors.forename: Aleksander V
authors.identifier: http://orcid.org/0000-0003-3628-1492
authors.initials: AV
authors.lastname: Vasilyev