Aryne formation via the hexadehydro Diels-Alder reaction and their Ritter-type transformations catalyzed by a cationic silver complex
作者:Sourav Ghorai、Daesung Lee
DOI:10.1016/j.tet.2017.02.008
日期:2017.7
nitriles under typical conditions for their formation. We demonstrated, however, that structurally diverse arynes could be generated via the hexadehydro Diels-Alder reaction and trapped with nitriles to induce the Ritter-type reaction when catalyzed by a cationic silver species. Presumably, under these conditions, the transiently formed aryne-silver complexes react with nitriles initially to form nitrilium
Mechanism of the Intramolecular Hexadehydro-Diels–Alder Reaction
作者:Daniel J. Marell、Lawrence R. Furan、Brian P. Woods、Xiangyun Lei、Andrew J. Bendelsmith、Christopher J. Cramer、Thomas R. Hoye、Keith T. Kuwata
DOI:10.1021/acs.joc.5b01356
日期:2015.12.4
Theoretical analysis of the mechanism of the intramolecular hexadehydro-Diels–Alder (HDDA) reaction, validated against prior and newly measured kinetic data for a number of different tethered yne-diynes, indicates that the reaction proceeds in a highly asynchronous fashion. The rate-determining step is bond formation at the alkyne termini nearest the tether, which involves a transition-state structure
The invention provides methods for cyclizing poly-yne compounds under mild conditions to provide cyclic compounds.
该发明提供了在温和条件下将聚炔化合物环化为环状化合物的方法。
Silver-Catalyzed Annulation of Arynes with Nitriles for Synthesis of Structurally Diverse Quinazolines
作者:Sourav Ghorai、Yongjia Lin、Yuanzhi Xia、Donald J. Wink、Daesung Lee
DOI:10.1021/acs.orglett.9b04395
日期:2020.1.17
An efficient silver catalyzed annulation reaction of aryne with nitriles to generate quinazolines is described. Arynes generated from triynes or tetraynes through a hexadehydro Diels-Alder reaction readily participated in an [A + 2B] mode of annulation with nitriles in the presence of AgSbF6 catalyst. The mechanism was explored by DFT calculations, which supports the silver-catalyzed formation of nitrilium
Benzocyclobutadienes: An Unusual Mode of Access Reveals Unusual Modes of Reactivity
作者:Xiao Xiao、Brian P. Woods、Wen Xiu、Thomas R. Hoye
DOI:10.1002/anie.201803872
日期:2018.7.26
The reaction of an aryne with an alkyne to generate a benzocyclobutadiene (BCB) intermediate is rare. We report here examples of this reaction, revealed by Diels–Alder trapping of the BCB by either pendant or external electron‐deficient alkynes. Mechanistic delineation of the reaction course is supported by DFT calculations. A three‐component process joining the benzyne first with an electron‐rich