N-aryl pyrazoles: DFT calculations of CH acidity and deprotonative metallation using a combination of lithium and zinc amides
作者:Floris Chevallier、Yury S. Halauko、Christelle Pecceu、Ibrahim F. Nassar、To Uyen Dam、Thierry Roisnel、Vadim E. Matulis、Oleg A. Ivashkevich、Florence Mongin
DOI:10.1039/c1ob05267e
日期:——
A series of N-aryl and N-heteroaryl pyrazoles have been deproto-metallated using a 2,2,6,6-tetramethylpiperidino-based mixed lithium–zinc combination. Mono-, di-, and tri-iodides have been obtained after subsequent trapping with iodine, depending on the substrate and on the quantity of base used. The results have been discussed in the light of the CH acidities of the substrates, determined both in the gas phase and in THF solution using the DFT B3LYP method.
Room-Temperature Copper-Catalyzed Carbon-Nitrogen Coupling of Aryl Iodides and Bromides Promoted by Organic Ionic Bases
作者:Chu-Ting Yang、Yao Fu、Yao-Bing Huang、Jun Yi、Qing-Xiang Guo、Lei Liu
DOI:10.1002/anie.200903158
日期:2009.9.21
solubility alone does not explain the performance of organic ionic bases in the room‐temperature coupling of aryl iodides and even bromides with aliphatic and aromatic amines and N‐heterocycles (NuH; see scheme). Conductivity measurements show that these organic ionic bases, which contain tetraalkylammonium or ‐phosphonium cations, are readily ionized in organic solvents.
[EN] PIKFYVE KINASE INHIBITORS<br/>[FR] INHIBITEURS DE KINASE PIKFYVE
申请人:ACURASTEM INCORPORATED
公开号:WO2021163727A1
公开(公告)日:2021-08-19
The present invention relates to compounds useful as inhibitors of phosphatidylinositol-3-phosphate 5-kinase (PIKfyve) as well as their use for treating diseases and disorders associated with PIKfyve.
A comparative study on Co-III-catalyzed direct C-H bond alkenylation of 1-phenylpyrazole derivatives with alkynyl carboxylic acids and arylalkynylsilanes under redox-neutral conditions has been disclosed. These methods show excellent selectivity with good to excellent yields. Trimethylsilylacetylene has been utilized as a vinyl source to obtain the corresponding styrene derivatives. The major differences
The arylation of pyrazole and derivatives can be achieved by coupling arenediazonium species (formed in situ fromanilines) by using a catalytic system that employs low‐toxicity and inexpensive copper metal under very mild and ligand‐free conditions (T=20 °C). From other nitrogenheterocycles, the presence of an additive (NBu4I) significantly improves the efficiency of the catalytic system. These results