开发了金(I)催化的加氢胺化/环化异构化级联反应,从2-乙炔基色酰胺中产生吲哚并[8,7- b ]吲哚和吲哚[2,3- a ]-喹嗪衍生物。通过条件筛选确定了最佳条件,并根据合成底物探索了这些反应的官能团耐受性。通过密度泛函理论计算,深入了解了闭环选择性的解释。提出了级联反应的合理机制。吲哚并[8,7- b ]吲哚的衍生化和诺环定的全合成证明了该策略的实用性。
Synthesis of Benzo[<i>c</i>][2,7]naphthyridinones and Benzo[<i>c</i>][2,6]naphthyridinones via Ruthenium-Catalyzed [2+2+2] Cycloaddition between 1,7-Diynes and Cyanamides
A convenient method for the ruthenium-catalyzed synthesis of benzo[c]naphthyridinone derivatives is reported. The [2+2+2] cycloaddition from various mono- and disubstituted 1,7-diynes and cyanamides provided benzo[c][2,7]naphthyridinones as major products and benzo[c][2,6]naphthyridinones as minor ones in yields of ≤79% and regioselectivities of ≤99:1. This method is amenable to internal and terminal
报道了一种简便的钌催化合成苯并[ c ]萘啶酮衍生物的方法。各种单取代和双取代的 1,7-二炔和单氰胺的 [2+2+2] 环加成反应提供苯并[ c ][2,7]萘啶酮作为主要产物,苯并[ c ][2,6]萘啶酮作为次要产物产率≤79%,区域选择性≤99:1。该方法适用于内部和末端二炔以及许多具有不同官能团耐受性的氰胺。
Palladium-catalyzed decarboxylative cyclization of α-acyloxyketones having an allene moiety in the tether
作者:Akimasa Yabuta、Yoshihiro Oonishi、Ryohei Doi、Kazuhiro Morisaki、Yoshihiro Sato
DOI:10.1039/d2nj04657a
日期:——
herein report palladium(0)-catalyzed decarboxylative cyclization of α-acyloxyketones having an allene moiety in the tether, giving various cyclohexanone derivatives. DFT calculations suggested that the reaction proceeds in the following sequence: (1) oxidative addition of the C(α)–Obond of α-acyloxyketones 1 to a palladium(0) complex; (2) insertion of the terminal allene double bond into the Pd–C(sp3)
Synthesis and Solid-State Structure of Perfluorophenyl End-Capped Polyynes
作者:Jamie Kendall、Robert McDonald、Michael J. Ferguson、Rik R. Tykwinski
DOI:10.1021/ol800583r
日期:2008.6.5
Five new supramolecular building blocks have been synthesized on the basis of polyynes end-capped with pentafluorophenyl groups, including three symmetrical (16, 17, 18) and two unsymmetrical polyynes (7 and 12). The solid-state behavior of these molecules based on the attractive electrostatic interactions of the phenyl and perfluorophenyl groups has been examined by X-ray crystallographic analysis of 7, 12, and 16.25.
Oxidation of 1-Arylcyclohexa-2,5-dienes and Subsequent Double Michael Addition. A Rapid Access to the Büchi Ketone and the Pentacyclic Core of Aspidosperma Alkaloids
作者:Yannick Landais、Dawood Hosni Ibrahim、Julie Dunet、Frédéric Robert
DOI:10.3987/com-18-s(t)36
日期:——
The Pd-catalyzed oxidation of 1-arylcyclohexa-2,5-dienes, resulting from a Birch reductive allcylation, leads to the corresponding arylcyclohexadienones. A careful choice of the substituents on the starting biaryl affords arylcyclohexadieonones, which may then enter into a double Michael addition, opening an access to the tetracyclic core of terpene indole alkaloids of the aspidosperma family. This strategy was used to prepare the Buchi ketone, a key-intermediate in the synthesis of this class of alkaloids, in 6 synthetic operations and 17% overall yield from commercially available 2-aminobiphenyl.