Synthesis of spiro isoindolinone-indolines and 1,2-disubstituted indoles from 2-iodobenzamide derivatives
作者:Bharath Kumar Villuri、Trimurtulu Kotipalli、Veerababurao kavala、Sachin S. Ichake、Vijayalakshmi Bandi、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1039/c6ra15002k
日期:——
Copper catalyzed C-terminal and N-terminal attack of 2-alkynylanilines to 2-iodobenzamides afforded isoindolinones and 1,2-disubstituted indoles, respectively. Further, the isoindolinone derivatives were converted to spiro fused isoindolinone-indolines utilizing halonium ion mediated...
Pd/C was found to be an efficient and convenient metal catalyst in the homocoupling reaction for the synthesis of symmetrical biaryl diamides. The catalyst systemPd/C–KOAc showed high catalytic activity, and a variety of symmetrical biaryl diamides were conveniently synthesized from 2-halo- N -phenylbenzamides in moderate to good yields.
Controlled Photochemical Synthesis of Substituted Isoquinoline-1,3,4(2<i>H</i>)-triones, 3-Hydroxyisoindolin-1-ones, and Phthalimides via Amidyl Radical Cyclization Cascade
We report a controlled radicalcyclizationcascade of isoquinoline-1,3,4(2H)-triones, 3-hydroxyisoindolin-1-ones, and phthalimides from o-alkynylated benzamides by metal-free photoredox catalyzed amidyl N-centered radicaladdition to the C–C triple bond using the proton-coupled electron transfer (PCET) process under mild reaction conditions. A time tunable synthesis of 3-hydroxyisoindolin-1-ones and
A one-potstrategy for the synthesis of 3-hydroxy-3-furylisoindolinone derivatives is reported. The reaction proceeds via a copper-catalyzed oxidative cascade inter-molecular double cyclization of 2-iodobenzamide derivatives and propargyl dicarbonyl compounds in the presence of oxygen. The strategy involves several reactions including cyclization/coupling/double C(sp3)−H functionalization in a cascade
during the reaction. Mechanistic studies revealed that the key to the success of this reaction is the generation of a diboron-bridged five-membered ring as a transition state, in which the diboron-bridged five-membered ring and the benzene ring in the transition state are perpendicular to each other, owing to steric repulsion by the iodine atom at the ortho position. This chemoselectivity is suitable for