Kinetic Control of Rh(III)-Catalyzed Annulation of C–H Bonds with Quinones: Chemoselective Synthesis of Hydrophenanthridinones and Phenanthridinones
摘要:
A temperature-dependent redox-neutral Rh(III)-catalyzed C-H bond annulation of N-methoxybenzamides with quinones was developed for the chemoselective synthesis of hydrophenanthridinones and phenanthridinones. This reaction involves an Rh(III)-catalyzed C-H bond functionalization and a subsequent cyclization through the directing group nucleophilic addition to the carbonyl group at room temperature.
New Heteroannulation Reactions of <i>N</i>-Alkoxybenzamides by Pd(II) Catalyzed C–H Activation
作者:Joe W. Wrigglesworth、Brian Cox、Guy C. Lloyd-Jones、Kevin I. Booker-Milburn
DOI:10.1021/ol202187h
日期:2011.10.7
through a highly efficient and E-selective C–H activation/Heck/Aza-Wacker sequence. Substoichiometric amounts of benzoquinone can be employed in a cooperative oxidation system with O2, leading to facile purification of products. Modification of the reaction conditions provides a generalroute to substituted phthalimides by carbonylation with CO. Both systems were found to tolerate a wide range of functionality
Ruthenium(<scp>ii</scp>)-catalyzed amide directed spiroannulation with naphthoquinones: access to spiro-isoindolinone frameworks
作者:Suman Dana、Chandan Kumar Giri、Mahiuddin Baidya
DOI:10.1039/d0cc05438k
日期:——
A mild ruthenium(ii)-catalyzed spiroannulation between benzamides and naphthoquinones is developed for the succinct synthesis of biologically relevant spiro-isoindolinone scaffolds.
Synthesis of isoindolinones via palladium-catalyzed C–H activation of N-methoxybenzamides
作者:Dan-Dan Li、Ting-Ting Yuan、Guan-Wu Wang
DOI:10.1039/c1cc15897j
日期:——
The synthesis of isoindolinones from N-methoxybenzamides and alkenes has been achieved by Pd-catalyzed ortho sp2 CâH activation and intramolecular oxidative amidation, which involve the cleavage of four bonds and formation of two bonds.
Rh(III)- and Ir(III)-Catalyzed C–H Alkynylation of Arenes under Chelation Assistance
作者:Fang Xie、Zisong Qi、Songjie Yu、Xingwei Li
DOI:10.1021/ja501910e
日期:2014.3.26
Rh(III)- and Ir(III)-catalyzed, chelation-assisted C-H alkynylation of a broad scope of (hetero)arenes has been developed using hypervalent iodine-alkyne reagents. Heterocycles, N-methoxy imines, azomethine imines, secondary carboxamides, azo compounds, N-nitrosoamines, and nitrones are viable directing groups to entail ortho C-H alkynylation. The reaction proceeded under mild conditions and with controllable
An efficient method for the one‐pot synthesis of substituted phenanthridinone derivatives from N‐methoxybenzamides and aryltriethoxysilanes through rhodium‐catalyzed dual CHbondactivation and annulation reactions is described. A double‐cycle mechanism is proposed to account for this catalytic reaction. In addition, isotope‐labeling studies were performed to understand the intimate mechanism of the