functionalization. The reactions exclusively led to monoarylated products, and only ortho selectivity was observed in the aromatic ring connected to the nitrogen atom. Interestingly, no C-H bond functionalization was observed in the other benzene ring in the ortho position with respect to the carbonyl group. This ruthenium-catalyzed reaction displayed a high functional group tolerance, and it employed readily
Disclosed herein is an expedient synthesis of biologically important isoindolinone derivatives from reactions of 2-formylbenzoic acids with various amines. This method operates via a deliberately designed catalyst-free tandem reductive amination/cyclization cascade event triggered by a transfer hydrogenation process with easily available Hantzsch ester as the organic hydride source. The ease of operation
A facile and efficient method for the synthesis of N -substituted isoindolin-1-one derivatives under Pd(OAc) 2 /HCOOH system
作者:Yang Zhou、Ping Chen、Xue Lv、Junxing Niu、Yingying Wang、Min Lei、Lihong Hu
DOI:10.1016/j.tetlet.2017.04.073
日期:2017.6
A facile and efficient method for the synthesis of N-substituted isoindolin-1-one derivatives from 2-formylbenzoic acid and amine under Pd(OAc)2/HCOOH system has been described. The whole process is carried out in ligand-free conditions and furnished the desired products by reductive intramolecular cyclization. Furthermore, this procedure is applied successfully for the modification of natural products
4-(2-Phthalimidyl)benzoyl cyanide (Phibyl-CN) was designed as a fluorescent labeling reagent for primary and secondary alcohols in high-performance liquid chromatography. Reaction conditions were optimized with hexanol, benzylalcohol, cyclopentanol and 1-phenyl-1-propanol as model compounds of primary and secondary alcohols. Phibyl-CN reacted quantitatively with alcohols on heating at 50°C for 30 min in the presence of 4-dimethylaminopyridine to give the corresponding fluorescent esters which were separated on a reversed-phase column with fluorescence detection. The detection limits for alcohols labeled with the reagent were 0.24-0.38pmol per injection. The extents of conversion of primary and secondary alcohols into fluorescent esters were approximately 100%.
Site-selective Ru-catalyzed C–H bond alkenylation with biologically relevant isoindolinones: a case of catalyst performance controlled by subtle stereo-electronic effects of the weak directing group
The first use of biologically relevant isoindolinones as weak directing groups in transition metal-catalyzed carbon–carbon bond formation via C–H bond functionalization is presented. Notably, besides the presence of two aromatic C–Hsites available for functionalization, selective mono-alkenylation in the ortho-position with respect to the nitrogen atom were achieved with a readily available ruthenium