Herein, we report a highly efficient and practical method for pyridine‐derived heterobiaryl synthesis through palladium‐catalyzed electrophilic functionalization of easily available pyridine‐derived quaternary phosphonium salts. The nice generality of this reaction was goes beyond arylation, enabling facile incorporation of diverse carbon‐based fragments, including alkenyl, alkynyl, and also allyl
[EN] SUBSTITUTED 3,5-DIHYDRO-4H-IMIDAZOL-4-ONES FOR THE TREATMENT OF OBESITY<br/>[FR] 3,5-DIHYDRO-4-H-IMIDAZOL-4-ONES SUBSTITUES UTILISES DANS LE TRAITEMENT DE L'OBESITE
申请人:BAYER PHARMACEUTICALS CORP
公开号:WO2004058727A1
公开(公告)日:2004-07-15
This invention relates to substituted 3,5-dihydro-4H-imidazol-4-ones compounds which are useful in the treatment of obesity and obesity-related disorders, and as weight-loss and weight-control agents. The invention also provides methods for synthesis of the compounds, pharmaceutical compositions comprising the compounds, and methods of using such compositions for inducing weight loss and treating obesity and obesity-related disorders.
Construction of Heterobiaryl Skeletons through Pd-Catalyzed Cross-Coupling of Nitroarenes and Heterocyclic Arylborononate Esters with a Sterically Demanding NHC Ligand
作者:Wei Chen、Wanzhi Chen、Miaochang Liu、Huayue Wu
DOI:10.1021/acs.orglett.2c02796
日期:2022.9.30
cross-couplings of nitroarenes and heteroarylboronate esters has been developed. A number of heterobiaryl compounds containing pyridine, pyrimidine, quinoline, furan, thiophene, and pyrazole were prepared using [Pd(cinnamyl)Cl]2/2-aryl-5-(2,4,6-triisopropylphenyl)-2,3-imidazolylidene[1,5-a]pyridines as the catalysts in good to excellent yields. The synthetic practicality of this approach is demonstrated through
已经开发了钯催化的硝基芳烃和杂芳基硼酸酯的 Suzuki-Miyaura 交叉偶联。使用[Pd(肉桂基)Cl] 2 /2-芳基-5-(2,4,6-三异丙基苯基)-2,3-制备了许多含有吡啶、嘧啶、喹啉、呋喃、噻吩和吡唑的杂二芳基化合物咪唑亚基[1,5- a ]吡啶作为催化剂,收率良好。这种方法的合成实用性通过类药物分子的合成得到证明。
Reductive Cleavage of C(sp<sup>2</sup>)–CF<sub>3</sub> Bonds in Trifluoromethylpyridines
作者:Piers St. Onge、Shajia I. Khan、Adam Cook、Stephen G. Newman
DOI:10.1021/acs.orglett.3c00258
日期:2023.2.17
of an earth-abundant alkoxide base and silicon hydride species. A variety of pyridine and quinoline substrates bearing alkyl, aryl, and amino functional groups are reduced in moderate to high yields. The reaction is chemoselective for C(sp2)–CF3 groups located at the 2-position on the pyridine ring, leaving trifluoromethyl groups located elsewhere on the molecule intact. Preliminary mechanistic studies
Iodomethane is usually used as an electrophilic methylation reagent. Herein, we report its use as a C1 organocatalyst for the aerobic ortho-selective trifluoromethylation of pyridines in the absence of a transition metal. Trifluoroacetic acid (TFA) was employed as an inexpensive, readily available trifluoromethyl source. The reaction efficiently produced a variety of trifluoromethylation products,