Copper-catalyzed direct amination of benzylic hydrocarbons and inactive aliphatic alkanes with arylamines
作者:Hua Yao、Bo Xie、Xiaoyang Zhong、Shengzhou Jin、Sen Lin、Zhaohua Yan
DOI:10.1039/d0ob00491j
日期:——
A new synthetic method toward direct C-N bond formation through saturated C-H amination of benzylic hydrocarbons and inactive aliphatic alkanes with primary aromatic amines under an inexpensive catalyst/oxidant (Cu/DTBP) system has been developed. Both aminopyridines and anilines could react smoothly with primary and secondary benzylic C-H substrates or cyclohexane to form the corresponding aromatic
Base-mediated cascade amidination/<i>N</i>-alkylation of amines by alcohols
作者:Chunyan Zhang、Zuyu Liang、Fenghong Lu、Xiaofei Jia、Guoying Zhang、Mao-Lin Hu
DOI:10.1039/d0cc04831c
日期:——
amidination/N-alkylation reaction of amines by alcohols has been developed. For the first time, nitriles have been identified as an efficient and benign water acceptor reagent in N-alkylation. Notably, the procedure tolerates a series of functional groups, such as methoxyl, halo, vinyl and hetero groups, providing a convenient method to construct different substituted diamino compounds, 15N labeled
demonstrate a greener borrowinghydrogen methodology using the π-benzylpalladium system, which offers an efficient and environmentally friendly dehydrative N-monobenzylation of 2-aminopyridines with benzylic alcohols in the absence of base. The crossover experiment using benzyl-α,α-d2 alcohol and 3-methylbenzyl alcohol afforded H/D scrambled products, suggesting that the dehydrative N-benzylation in our
我们证明了使用π-苄基钯体系的更绿色的借用氢方法,该方法可在不存在碱的情况下,用苄基醇对2-氨基吡啶进行高效,环保的N-单苄基脱水。使用苄基-α交叉的实验中,α- d 2醇和3-甲基苄基,得到H / d醇加扰的产品,这表明脱水Ñ在我们的催化系统中,苄基化涉及一个借用的氢途径。KIE实验表明,速率测定步骤涉及苯甲醇的苄基位置的C–H键断裂(KIE = 2.9)。这种简单的无碱方案可以在温和的条件下以原子经济的方法实现,以中等至极好的收率提供所需的产物。
Water-promoted dehydrative coupling of 2-aminopyridines in heptane <i>via</i> a borrowing hydrogen strategy
A synthetic method for dehydrative N-benzylation promoted by water molecules in heptane using a π-benzylpalladium system has been developed. The presence of water significantly accelerates carbon-nitrogen bond formation, which is accomplished in an atom-economical process to afford the corresponding N-monobenzylated products. A crossover experiment afforded H/D scrambled products, which is consistent
The present invention provides compounds and pharmaceutical compositions that are selective antagonists of A
2B
adenosine receptors (ARs). These compounds and compositions are useful as pharmaceutical agents.