Stereoselective Synthesis of Methylene Oxindoles via Palladium(II)-Catalyzed Intramolecular Cross-Coupling of Carbamoyl Chlorides
作者:Christine M. Le、Theresa Sperger、Rui Fu、Xiao Hou、Yong Hwan Lim、Franziska Schoenebeck、Mark Lautens
DOI:10.1021/jacs.6b08925
日期:2016.11.2
We report a highly robust, general and stereoselective method for the synthesis of 3-(chloromethylene)oxindoles from alkyne-tethered carbamoyl chlorides using PdCl2(PhCN)2 as the catalyst. The transformation involves a stereo- and regioselective chloropalladation of an internal alkyne to generate a nucleophilic vinyl PdII species, which then undergoes an intramolecular cross-coupling with a carbamoyl
A copper(<scp>ii</scp>)-catalyzed annulative formylation of <i>o</i>-alkynylanilines with DMF: a single-step strategy for 3-formyl indoles
作者:Balaji Ganesan、Gopal Chandru Senadi、Bing-Chun Guo、Min-Yuan Hung、Wei-Yu Lin
DOI:10.1039/c8ra09214a
日期:——
developed for synthesizing multisubstituted 3-formyl indole scaffolds. This one-pot reaction proceeds through a cascade 5-endo-dig cyclization followed by formylation to construct 1,2-disubstituted 3-formyl indoles. The key aspects of this synthesis method are the broad substrate scope (with 38 examples), and well tolerating various functional groups. In addition, a detailed mechanism has been proposed, where
Bis(dibenzylideneacetone)palladium(0)/<i>tert-</i>Butyl Nitrite- Catalyzed Cyclization of<i>o</i>-Alkynylanilines with<i>tert-</i>Butyl Nitrite: Synthesis and Applications of Indazole 2-Oxides
作者:Gopal Chandru Senadi、Ji-Qi Wang、Babasaheb Sopan Gore、Jeh-Jeng Wang
DOI:10.1002/adsc.201700456
日期:2017.8.17
An efficient method for the synthesis of 1‐benzyl/arylindazole 2‐oxides via a bis(dibenzylideneacetone)palladium(0) [Pd(dba)2]/tert‐butyl nitrite (TBN)‐catalyzed reaction of o‐alkynylaniline derivatives with TBN is reported. The overall transformation involves the formation of three new bonds via N‐nitrosation (N–NO), 5‐exo‐dig cyclization (C–N) and oxidation (C=O). The notable features are the mild