Annulation of Ketones with Vinamidinium Hexafluorophosphate Salts: An Efficient Preparation of Trisubstituted Pyridines
摘要:
[GRAPHICS]alpha-Aryl ketones react with vinamidinium hexafluorophosphate salts to give access to the corresponding 3-arylpyridines, The annulation reactions proceed in good to excellent yields with vinamidinium salts containing electron-withdrawing groups at the beta-position (R-2). The reaction was applied to the preparation of the COX-2 specific inhibitor 5-chloro-3-(4-methylsulfonyl)phenyl-2-(2-methyl-5-pyridynl)pyridine (1), as well as a series of analogues.
protocol for the synthesis of 1-heteroaryl-4-(N-methyl)aminopiperidines starting from heteroaryl chloride derivatives is described. A broad range of 1-heteroaryl-4-(N-Boc-N-methyl)aminopiperidine derivatives were obtained in good to excellent yields using DavePhos as optimal ligand for Pd-catalyzed Buchwald-Hartwigamination reaction. After a mild and efficient acidolysis the amination products could
Triphenylphosphine derivative, production process therefor, palladium complex thereof, and process for producing biaryl derivative
申请人:——
公开号:US20030065208A1
公开(公告)日:2003-04-03
Provided are a novel triphenyl phosphine derivative synthesized from a triphenylphosphine and a hydroxy-containing lactone; a palladium and a nickel complexes comprising the derivative as a ligand; and a process for preparing a biaryl derivative using the complex as a catalyst. A product can be easily separated from a catalyst or a phosphorus compound, and biaryl derivative can be synthesized in a higher yield, by using the complex of the present invention as a catalyst.
PHOSPHINE-BASED COMPOUND AND ORGANIC ELECTROLUMINESCENCE DEVICE INCLUDING THE SAME
申请人:SAMSUNG DISPLAY CO., LTD.
公开号:US20190019959A1
公开(公告)日:2019-01-17
A phosphine-based compound and an organic electroluminescence device including the same, the phosphine-based compound being represented by the following Formula 1:
一种基于膦的化合物和包括该化合物的有机电致发光器件,所述基于膦的化合物由以下化学式1表示:
An improved synthesis of N-aryl and N-heteroaryl substituted piperidones
An efficient Pd(0)-catalyzed protocol for the rapid and efficient preparation of N-aryl and N-heteroaryl substitutedpiperidones is described. The two step syntheses proceed with an overall yield of 50–70% using X-Phos as optimal ligand for the Pd(0)-catalyzed Buchwald–Hartwig amination followed by subsequent hydrolysis of resulted ketals.