Palladium-Catalyzed Synthesis of Indoles and Isoquinolines with <i>in Situ</i> Generated Phosphinimine
作者:Qi Zhou、Zhikun Zhang、Yujing Zhou、Shichao Li、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.joc.6b01864
日期:2017.1.6
A palladium-catalyzed synthesis of polysubstituted indoles and isoquinolines through the coupling of aryl bromides with 2-alkynyl arylazides or 2-alkynyl benzylazides has been developed. This method provides straightforward access to indoles and isoquinolines with high efficiency and excellent functional group compatibility. In this transformation, the iminophosphorane in situ generated from azides
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
A new, selective method for the synthesis of 4-haloisoquinolines and 3-haloindoles is presented by the halopalladation cyclizations of alkynes with azides. In the presence of PdX2 (X = Br, Cl) and halide sources, a variety of 2-alkynylbenzylazides or 2-alkynyl aryl azides smoothly underwent the halopalladation cyclization reaction to afford the corresponding 3-substituted 4-haloisoquinolines and
A PdI2/I2-catalyzed thiolation-annulation route of alkynes with azides and disulfides for the synthesis of 4-sulfenylisoquinolines is described. This route allows numerous 2-alkynylbenzyl azides to react with disulfides or 1,2-diphenyldiselane leading to the corresponding 4-chalcogen-substituted isoquinolines in moderate to good yields.
Synthesis of Isoquinolylselenocyanates and Quinolylselenocyanates via Electrophilic Selenocyanogen Cyclization Induced by Pseudohalogen (SeCN)
<sub>2</sub>
Generated
<i>in situ</i>
A strategy for the synthesis of isoquinolylselenocyanates and quinolylselenocyanates through electrophilicselenocyanogencyclization has been developed. The feature of this reaction is that the sequential process was induced directly by generated in situpseudohalogen (SeCN)2generated in situ. Additionally, the obtained selenocyanates allowed functional group diversification, which could be potential