Amination of Heteroaryl Chlorides: Palladium Catalysis or S<sub>N</sub>Ar in Green Solvents?
作者:Katie Walsh、Helen F. Sneddon、Christopher J. Moody
DOI:10.1002/cssc.201300239
日期:2013.8
reaction of heteroarylchlorides in the pyrimidine, pyrazine and quinazoline series with amines in water in the presence of KF results in a facile SNAr reaction and N‐arylation. The reaction is less satisfactory with pyridines unless an additional electron‐withdrawing group is present. The results showed that the transition‐metal‐free SNAr reaction not only compares favourably to palladium‐catalysed
嘧啶、吡嗪和喹唑啉系列中的杂芳基氯化物与水中的胺在 KF 存在下发生反应,导致容易的 S N Ar 反应和N芳基化。除非存在额外的吸电子基团,否则吡啶的反应不太令人满意。结果表明,无过渡金属的 S N Ar 反应不仅优于钯催化的偶联反应,而且在碱和溶剂方面也可以在环境可接受的(“绿色”)条件下进行。
Copper-catalyzed and additive free decarboxylative trifluoromethylation of aromatic and heteroaromatic iodides
作者:Martin B. Johansen、Anders T. Lindhardt
DOI:10.1039/c9ob02635e
日期:——
A copper-catalyzed decarboxylative trifluoromethylation of (hetero)aromatic iodides has been developed. Importantly, this new copper-catalyzed reaction operates in the absence of any ligands and metal additives. The protocol shows good functional group tolerance and is compatible with heteroaromatic systems. The reaction proved scalable to a 15 mmol scale with increased yield. Finally, late-stage installation
Carbene adduct of cyclopalladated ferrocenylimine-assisted synthesis of aminopyridine derivatives by the amination of chloropyridines with primary and secondary amines
作者:Bing Mu、Jingya Li、Yangjie Wu
DOI:10.1002/aoc.3026
日期:2013.9
on Buchwald–Hartwig aminations. Using 1 mol% N‐heterocyclic carbene adduct of cyclopalladated ferrocenylimine in the presence of 1.5 equiv. tBuOK as base in dioxane at 110°C offered moderate to excellent yields in the reaction of chloropyridines with primary and secondaryamines, including sterically hindered amines and alkyl amines.
Cobalt-Catalyzed C-N Bond-Forming Reaction between N-Aromatic 2-Chlorides and Secondary Amines
作者:Gabriel Toma、Ken-ichi Fujita、Ryohei Yamaguchi
DOI:10.1002/ejoc.200900597
日期:2009.9
Secondaryamines react with N-aromatic 2-chlorides in the presence of a catalytic amount of cobalt chloride. When DPPP was added as ligand, the yield was further improved. The N-aromatic-containing tertiary amines formed are interesting due to their potential biological activity. This work represents the first cobalt-catalyzed approach to C–N bond formation involving N-aromatic 2-chlorides and secondary
[Retracted] Enantioselective Rh- or Ir-catalyzed Directed C(sp<sup>3</sup>)–H Borylation with Phosphoramidite Chiral Ligands
作者:Ronald L. Reyes、Tomoya Harada、Tohru Taniguchi、Kenji Monde、Tomohiro Iwai、Masaya Sawamura
DOI:10.1246/cl.170853
日期:2017.12.5
Enantioselective heteroatom-directed C(sp3)–H borylation reactions of 2-aminopyridines and 2-alkylpyridines with Rh- and Ir catalytic systems using commercially available chiral monophosphine ligands, respectively, were developed. This methodology provides an innovative example of a homogeneous catalytic system for C(sp3)–H borylation, and allows the direct synthesis of optically active alkylboronates
分别使用市售的手性单膦配体开发了 2-氨基吡啶和 2-烷基吡啶与 Rh-和 Ir 催化体系的对映选择性杂原子定向 C(sp3)-H 硼酸化反应。该方法为 C(sp3)-H 硼酸化的均相催化系统提供了一个创新示例,并允许直接合成具有中等对映选择性的光学活性烷基硼酸酯。