Palladium-Catalyzed Decarboxylative Couplings of 2-(2-Azaaryl)acetates with Aryl Halides and Triflates
作者:Rui Shang、Zhi-Wei Yang、Yan Wang、Song-Lin Zhang、Lei Liu
DOI:10.1021/ja107103b
日期:2010.10.20
Pd-catalyzed decarboxylative cross-couplings of 2-(2-azaaryl)acetates with arylhalides and triflates have been discovered. This reaction is potentially useful for the synthesis of some functionalized pyridines, quinolines, pyrazines, benzoxazoles, and benzothiazoles. Theoretical analysis shows that the nitrogen atom at the 2-position of the heteroaromatics directly coordinates to Pd(II) in the decarboxylation
The first example of benzylic C—H triflylation was accomplished with pyridine as a directing group. The reaction of various 2‐benzylpyridines and (CF3SO2)2O in the presence of NEt3 in CH2Cl2 proceeded smoothly to afford the corresponding benzyl triflones in moderate to high yields.
用吡啶作为指导基团完成苄基CHF3-三氟甲基化的第一个实例。在NEt 3存在下,各种2-苄基吡啶和(CF 3 SO 2)2 O在CH 2 Cl 2中的反应顺利进行,以中等至高收率提供了相应的苄基三氟甲酮。
Ligand-Free Iridium-Catalyzed Dehydrogenative <i>ortho</i>
C−H Borylation of Benzyl-2-Pyridines at Room Temperature
作者:Yuhuan Yang、Qian Gao、Senmiao Xu
DOI:10.1002/adsc.201801292
日期:2019.2.19
A convenient and ligand‐free iridium‐catalyzed dehydrogenative orthoC−Hborylation of benzyl‐2‐pyridines has been developed. The reaction proceeds smoothly at room temperature using pinacolborane as a borylating reagent in the presence of catalytic amount of [IrOMe(COD)]2. The reaction is compatible with many functional groups, providing a vast array of ortho borylated products in moderate to excellent
The invention relates to substituted nicotinamides, to processes for their preparation, to medicaments comprising these compounds and to the use of these compounds in the preparation of medicaments.