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
Synthesis of Indoles upon Sequential Reaction of 3-Alkynylpyrrole-2-carboxaldehydes with Iodonium Ions and Alkenes. Preparation of Related Benzofuran and Benzothiophene Derivatives
作者:José Barluenga、Henar Vázquez-Villa、Alfredo Ballesteros、José M. González
DOI:10.1002/adsc.200404293
日期:2005.3
Di- and trisusbstituted indoles 2 have been prepared by reaction of pyrroles 1 with alkenes via iodonium-induced benzannulationreaction. Enamines and enol ethers are also useful partners in that cyclisation process. This regioselective transformation can be easily adapted to prepare related benzofuran and benzothiophene skeletons.
Synthesis of Furano[2,3-<i>c</i>]pyran-3-one and Thieno[2,3-<i>c</i>]pyran-3-one Derivatives through the Coupling of 3-Alkynyl-2-heteroaromatic Carboxaldehydes with Fischer Carbene Complexes: Total Synthesis of a <i>Baccharis</i>-Derived Cadinene Derivative
作者:Yanshi Zhang、James W. Herndon
DOI:10.1021/jo011136y
日期:2002.6.1
The coupling of Fischercarbenecomplexes with 3-alkynyl-2-heteroaromatic carboxaldehyde derivatives has been examined. The reaction affords pyrones fused to furans or thiophenes in a single step. The compounds are stable enough for isolation. If the carbenecomplex features a remote alkene substituent, a subsequent Diels-Alderreaction can occur. This reaction has been used as the key step in the
Iodine-Mediated Electrophilic Cyclization of 2-Alkynyl-1-methylene Azide Aromatics Leading to Highly Substituted Isoquinolines and Its Application to the Synthesis of Norchelerythrine
作者:Dirk Fischer、Hisamitsu Tomeba、Nirmal K. Pahadi、Nitin T. Patil、Zhibao Huo、Yoshinori Yamamoto
DOI:10.1021/ja805326f
日期:2008.11.19
corresponding isoquinoline derivatives in excellent to allowable yields. Electron-donating and electron-accepting substituents on the aromatic ring were equally tolerated, and either acidic or basic (or even neutral) reaction conditions, depending on the reactivity of the substrate, could be applied to smoothly convert the azide starting materials into the desired isoquinoline products in moderate to good yields
Synthesis of furano[2,3-c]-pyran-3-one and thieno[2,3-c]-pyran-3-one derivatives through the coupling of 3-alkynyl-2-heteroaromatic carboxaldehydes with Fischer carbene complexes
作者:Yanshi Zhang、James W Herndon
DOI:10.1016/s0040-4039(00)02123-7
日期:2001.1
The coupling of Fischercarbenecomplexes with 3-alkynyl-2-heteroaromatic carboxaldehyde derivatives has been examined. The reaction affords pyrones fused to furans or thiophenes in a single step. The compounds are stable enough for isolation. If the carbenecomplex features a remote alkene substituent, a subsequent Diels–Alderreaction can occur.