Iridium- and rhodium-catalyzed C–H activation and formyl arylation of benzaldehydes under chelation-assistance
作者:Xifa Yang、He Wang、Xukai Zhou、Xingwei Li
DOI:10.1039/c6ob00825a
日期:——
Mild and efficient synthesis of benzophenones via Ir(iii)- and Rh(iii)-catalyzed, directing group-assisted formyl C–H arylation of benzaldehydes has been achieved using diaryliodonium salts, in which Rh(iii) and Ir(iii) catalysts exhibited a complementary substrate scope.
Room Temperature Palladium-Catalyzed Decarboxylative Acyl/Aroylation using [Fe(III)(EDTA)(η<sup>2</sup>-O<sub>2</sub>)]<sup>3−</sup>as Oxidant at Biological pH
作者:Sugandha Sharma、Imran A. Khan、Anil K. Saxena
DOI:10.1002/adsc.201201085
日期:2013.3.11
The purple‐coloured iron peroxo complex [Fe(III)EDTA(η2‐O2)]3− as a novel reagent system for Pd‐catalyzed decarboxylative ortho‐acylation of acetanilides with α‐oxocarboxylic acids at roomtemperature in aqueous media has been realized. This reaction provides an effective access to ortho‐acylacetanilides under mild conditions.
Palladium-catalyzed dehydrogenative coupling reactions between acetanilides and benzylicalcohols under aqueous conditions are reported. A wide range of benzophenone derivatives could be obtained in good to excellent yields up to 98 %. Mechanism studies showed that a bimetallic palladium cyclopalladated complex might be involved in the catalysis.
Palladium Catalyzed Direct Acylation of Iodo-Acetanilides/Iodo-Phenyl Acetates: Domino One-Pot Synthesis of 2-Quinolinones
作者:Scuhand Basuli、Gedu Satyanarayana
DOI:10.1002/ejoc.201701250
日期:2018.2.28
acetates with aldehydes, was presented. Simple bench-top aldehydes were used as the non-toxic acylating agents. This protocol comprises direct coupling with aldehydes without activating the carbonyl group and without the directing group assistance. The strategy was applied to a domino one-potsynthesis of 2-quinolinones via acylation and intramolecularaldolcondensation. Significantly, the strategy was extended
The synthesis of a novel class of antiulcer agents, the substituted 4-phenyl-2-(1-piperazinyl)quinolines, and their pharmacological activities (inhibitory effects on hypothermia induced by reserpine and on gastric ulcers induced by stress or ethanol) are described. These compounds can be classified into three groups (a group predominantly effective on the stress-induced ulcer, one effective on both the stress- and ethanol-induced ulcers, and one selectively effective on the ethanol-induced ulcer), with regard to antiulcer activity. The inhibitory effect on stress-induced ulcer was found to be in close relation to the antagonism of hypothermia. The structure-activity relationships in these compounds are described. Among the compounds, 2-(4-ethyl-1-piperazinyl)-4-phenylquinoline dimaleate (9, AS-2646) showed a potent inhibition of stress-induced ulcer and gastric acid secretion, possively through action on the central nervous system, and it was selected for clinical evaluation.