Rhodium(I)-Catalyzed Aryl C–H Carboxylation of 2-Arylanilines with CO<sub>2</sub>
作者:Yuzhen Gao、Zhihua Cai、Shangda Li、Gang Li
DOI:10.1021/acs.orglett.9b01105
日期:2019.5.17
An unprecedented Rh(I)-catalyzed, amino-group-assisted C–H carboxylation of 2-arylanilines with CO2 under redox-neutral conditions has been developed. This reaction was promoted by a phosphine ligand with t-BuOK as the base and did not require the use of additional strong organometallic reagent. It enabled an efficient direct conversion of a broad range of 2-(hetero)arylanilines including electron-deficient
A general concise method for the synthesis phenanthridin-6(5H)-ones via photoinduced intramolecular annulation of N-phenylbenzamides was developed. Under argon atmosphere and room temperature, phenanthridin-6(5H)-ones were obtained via irradiation N-phenylbenzamides with a 280 nm UV lamp in the presence of methanesulfonic acid in toluene. The mechanism is illustrated and believed to proceed in the
开发了一种通过光诱导N-苯基苯甲酰胺分子内环化合成菲啶-6(5 H )-ones的通用简明方法。在氩气和室温下,在甲苯中甲磺酸存在下,通过用 280 nm 紫外灯照射N-苯基苯甲酰胺,得到菲啶-6(5 H )-酮。该机理被说明并认为按照酰胺互变异构、6π-电环化、[1,5]-H 位移、酰胺-亚胺互变异构、酮-烯醇互变异构和放氢的顺序进行。
Synthesis of phenanthridinones viapalladium-catalyzed C(sp<sup>2</sup>)–H aminocarbonylation of unprotected o-arylanilines
An efficient synthesis of free (NH)-phenanthridinones through Pd-catalyzed C(sp(2))-H aminocarbonylation of unprotected o-arylanilines under an atmospheric pressure of CO has been developed. Some ortho heteroarene substituted anilines as well as N-alkyl protected o-arylanilines are also suitable substrates for this C-H aminocarbonylation reaction.
Phenanthridinone derivatives have been prepared in good to high yields via palladium-catalyzed cyclization of readily available N-benzyl-N-benzoyl-o-iodoanilides.