The Reaction ofo-Alkynylarene and Heteroarene Carboxaldehyde Derivatives with Iodonium Ions and Nucleophiles: A Versatile and Regioselective Synthesis of 1H-Isochromene, Naphthalene, Indole, Benzofuran, and Benzothiophene Compounds
作者:José Barluenga、Henar Vázquez-Villa、Isabel Merino、Alfredo Ballesteros、José M. González
DOI:10.1002/chem.200501505
日期:2006.7.24
adapted to accomplish the synthesis of indole, benzofuran, and benzothiophenederivatives (23, 27, and 28, respectively). The three patterns of reactivity observed for the o-alkynylbenzaldehyde derivatives with IPy(2)BF(4) stem from a common iodinated isobenzopyrylium ion intermediate, A, that evolves in a different way depending on the nucleophile present in the reaction medium. A mechanism is proposed
ortho-Carbonylarylacetylenols have been employed for the synthesis of dihydronaphthofurans via AgTFA-catalyzed annulation reaction. A broad range of substrates both ortho-keto- and ortho-formylarylacetylenols could be employed in this transformation providing the desired products in good yields. However, the reaction pathways of these two substrates are different. The reaction of the ketone precursors could directly
A new approach for the synthesis of indenone derivatives using I2-promoted cyclization of ortho-alkynylarylketones has been developed. This method provides a metal-free and convenient route for regioselective synthesis of indenones employing ortho-alkynylarylketones with predefined substituents to obtain indenone products in moderate to good yields.
Generation and Trapping of Isobenzofuran Intermediates Formed in the Coupling of Fischer Carbene Complexes and <i>o</i>-Alkynylbenzoyl Derivatives
作者:Delu Jiang、James W. Herndon
DOI:10.1021/ol005691i
日期:2000.5.1
[formula: see text] The coupling of o-alkynylbenzoyl derivatives with carbene complexes has been investigated. The reaction initially affords isobenzofuran derivatives, which convert to alkylidenephthalan derivatives or can be trapped by various dienophiles to afford benzo-oxanorbornene derivatives.
Asymmetric Hydrogenation of In Situ Generated Isochromenylium Intermediates by Copper/Ruthenium Tandem Catalysis
作者:Tingting Miao、Zi-You Tian、Yan-Mei He、Fei Chen、Ya Chen、Zhi-Xiang Yu、Qing-Hua Fan
DOI:10.1002/anie.201611291
日期:2017.4.3
The first asymmetrichydrogenation of in situgeneratedisochromenylium derivatives is enabled by tandemcatalysis with a binary system consisting of Cu(OTf)2 and a chiral cationic ruthenium–diamine complex. A range of chiral 1H‐isochromenes were obtained in high yields with good to excellent enantioselectivity. These chiral 1H‐isochromenes could be easily transformed into isochromanes, which represent