Palladium-Catalyzed N-Monoarylation of Amidines and a One-Pot Synthesis of Quinazoline Derivatives
摘要:
A method for the Pd-catalyzed N-arylation of both aryl and alkyl amidines with a wide range of aryl bromides, chlorides, and triflates is described. The reactions proceed in short reaction times and with excellent selectivity for monoarylation. A one-pot synthesis of quinazoline derivatives, via addition of an aldehyde to the crude reaction mixture following Pd-catalyzed N-arylation, is also demonstrated.
Ruthenium(II)‐Catalyzed C−H Activation of Imidamides and Divergent Couplings with Diazo Compounds: Substrate‐Controlled Synthesis of Indoles and 3
<i>H</i>
‐Indoles
作者:Yunyun Li、Zisong Qi、He Wang、Xifa Yang、Xingwei Li
DOI:10.1002/anie.201606316
日期:2016.9.19
Indoles are an important structural motif that is commonly found in biologically active molecules. In this work, conditions for divergentcouplings between imidamides and acceptor–acceptor diazo compounds were developed that afforded NH indoles and 3H‐indoles under ruthenium catalysis. The coupling of α‐diazoketoesters afforded NH indoles by cleavage of the C(N2)−C(acyl) bond whereas α‐diazomalonates
Novel and efficient base-mediated N-alkylation and amidation of amidines with alcohols have been developed, which can be carried out in one-pot reaction conditions, which allows for the synthesis of a wide range of N-alkyl amines and free amides in good to excellent yields with high atom economy. In contrast to borrowing hydrogen/hydrogen autotransfer or oxidative-type N-alkylation reactions, in which
Transition‐Metal‐Free Synthesis of 1,2‐diphenyl‐1
<i>H</i>
‐benzo[
<i>d</i>
] Imidazole Derivatives from
<i>N</i>
‐phenylbenzimidamides and Cyclohexanones
A transition‐metal‐free strategy for the formation of 1,2‐diphenyl‐1H‐benzo[d] imidazoles from N‐phenylbenzimidamides and cyclohexanones is introduced. This is the first report on the direct synthesis of 1,2‐diphenyl‐1H‐benzo[d] imidazoles from cyclohexanones and N‐phenylbenzimidamides via iodine‐ promoted oxidative cyclization. Non‐aromatic cyclohexanones were smoothly dehydrogenated, and acted as
引入了一种无过渡金属的策略,用于由N-苯基苯甲酰胺和环己酮形成1,2-二苯基-1 H-苯并[ d ]咪唑。这是关于通过碘促进的氧化环化反应,由环己酮和N-苯基苯甲酰胺直接合成1,2-二苯基-1 H-苯并[ d ]咪唑的第一份报告。非芳族环己酮可顺利脱氢,并使用氧气作为绿色氧化剂充当芳基源。碘的催化使用使得该方法相当简单,更经济和方便。在优化条件下,各种取代的1,2-二苯基-1 H-苯并[ d使咪唑平稳反应,并以中等至优异的产率生成所需的取代的咪唑。
Application of the copper catalysed N-arylation of amidines in the synthesis of analogues of the chemical tool, blebbistatin
作者:Christopher P. A. T. Lawson、Alexandra M. Z. Slawin、Nicholas J. Westwood
DOI:10.1039/c0cc03624b
日期:——
A robust protocol for the CuI-catalysed arylation of amidines is presented. Whilst the initially identified conditions were useful for benzamidine-derived substrates, difficulties were encountered with more complex substrates. This problem was overcome following a change in ligand type, enabling the synthesis of analogues of the chemical tool, blebbistatin.