Cationic Au(I)-Catalyzed Cycloisomerization of Aromatic Enynes for the Synthesis of Substituted Naphthalenes
作者:Takanori Shibata、Yasunori Ueno、Kazumasa Kanda
DOI:10.1055/s-2006-926261
日期:——
A cationic Au(I) complex catalyzed the cycloisomerization of aromaticenynes that possess a substituent on their alkyne terminus. Cyclization of the 6-endo-dig type proceeded dominantly to give 1,3-di- and 1,2,3-trisubstituted naphthalenes.
Synthesis of Functionalized Phenanthrenes via Regioselective Oxidative Radical Cyclization
作者:Kamalkishore Pati、Christopher Michas、David Allenger、Ilya Piskun、Peter S. Coutros、Gabriel dos Passos Gomes、Igor V. Alabugin
DOI:10.1021/acs.joc.5b01014
日期:2015.12.4
preparation of fully conjugated molecules. In this work, we report an oxidatively terminated Bu3Sn-mediated cyclization of an alkyne where AIBN, the commonly used initiator, takes on a new function as an oxidative agent. Sn-mediated radical transformation of biphenyl aryl acetylenes into functionalized phenanthrenyl stannanes can be initiated via two potentially equilibrating vinyl radicals, one of which can
Synthesis of Fluorenes<i>via</i>the Palladium-Catalyzed 5-<i>exo-dig</i>Annulation of<i>o</i>-Alkynylbiaryls
作者:Natalia Chernyak、Vladimir Gevorgyan
DOI:10.1002/adsc.200800765
日期:2009.5
The direct Pd-catalyzed intramolecular rapidly with electron-deficient benzene ring, which, in hydroarylation of o-alkynyl biaryls proceeded in highly combination with a substantial isotope effect observed, stereoselective manner producing fluorenes 2, the products of 5-exo-dig cyclization, in excellent yields. The cascade intermolecular arylation, incorporated in this transformation, allowed for efficient
Synthesis of Spirocyclic Cyclobutenes through Desulfinative Spirocyclisation of
<i>gem</i>
‐Bis(triflyl)cyclobutenes
作者:Shoki Hoshikawa、Hikaru Yanai、Takashi Matsumoto
DOI:10.1002/chem.202200704
日期:2022.6.10
Spiro[cyclobutene-1,9′-fluorene] framework is effectively constructed from easily available biaryl-alkynes through a two-step protocol including selective (2+2) cycloaddition with in situ-generated Tf2C=CH2 and HFIP-promoted desulfinative spirocyclisation.
Site-Specific Preparation of 2-Carboalkoxy-4-substituted Naphthalenes and 9-Alkylphenanthrenes and Evidence for an Allene Intermediate in the Novel Base-Catalyzed Cyclization of 2-Alkynylbiphenyls
作者:Yi Wang、Donald J. Burton
DOI:10.1021/ol0620850
日期:2006.11.9
[GRAPHICS]A site-specific preparation of 2-carboalkoxy-4-substituted naphthalenes and 9-alkylphenanthrenes is described. The successful cyclization of an allene intermediate provides supportive evidence for the previously proposed mechanism.