Direct synthesis of ring-fused quinolines and pyridines catalyzed by <i>NN</i><sub><i>H</i></sub><i>Y</i>-ligated manganese complexes (Y = NR<sub>2</sub> or SR)
作者:Zheng Wang、Qing Lin、Ning Ma、Song Liu、Mingyang Han、Xiuli Yan、Qingbin Liu、Gregory A. Solan、Wen-Hua Sun
DOI:10.1039/d1cy01945g
日期:——
Four cationic manganese(I) complexes, [(fac-NNHN)Mn(CO)3]Br (Mn-1–Mn-3) and [(fac-NNHS)Mn(CO)3]Br (Mn-4) (where NNH is a 5,6,7,8-tetrahydro-8-quinolinamine moiety), have been synthesized and evaluated as catalysts for the direct synthesis of quinolines and pyridines by the reaction of a γ-amino alcohol with a ketone or secondary alcohol; NNHS-ligated Mn-4 proved the most effective of the four catalysts
四种阳离子锰( I )配合物,[( fac-NN H N )Mn(CO) 3 ]Br ( Mn-1 – Mn-3 ) 和 [( fac-NN H S )Mn(CO) 3 ]Br ( Mn -4 )(其中N H是 5,6,7,8-四氢-8-喹啉胺部分),已被合成并评估为通过 γ-氨基醇与酮或仲醇;NN H S -连接的Mn-4被证明是四种催化剂中最有效的。在催化剂负载量为 0.5-5.0 mol% 的情况下,反应进行得很好,并且可以耐受不同的官能团,如烷基、环烷基、烷氧基、氯化物和杂芳基。基于 DFT 计算和实验证据,提出了一种涉及无受体脱氢偶联 (ADC) 的机制。值得注意的是,这种基于锰的催化方案为广泛合成重要的取代单环、双环和三环N-杂环(包括 50 个喹啉和 26 个吡啶实例)提供了一条有前途的绿色环保途径,分离产率高达 93 %。
An improved synthesis of quinolines from β-bromovinyl aldehydes and primary arylamines in the presence of a palladium catalyst
作者:Chan Sik Cho、Hyo Bo Kim、Wen Xiu Ren、Nam Sik Yoon
Understanding the Visible-Light-Initiated Manganese-Catalyzed Synthesis of Quinolines and Naphthyridines under Ambient and Aerobic Conditions
作者:Kamaless Patra、Arindom Bhattacherya、Chenfei Li、Jitendra K. Bera、Han Sen Soo
DOI:10.1021/acscatal.2c05086
日期:2022.12.16
scope of >30 examples under modest reaction conditions. A variety of 2-aminobenzyl alcohols containing electron-donating and electron-deficient groups and (2-aminopyridin-3-yl)methanol are converted to the corresponding quinolines and naphthyridines using ambient air as an oxidant in the presence of KOH. We synthesized a wide range of derivatives, including some of the bioactive antimalarial drug chloroquine
Molybdenum-based efficient and broadly applicable catalytic system is presented for the dehydrogenative coupling of γ-/β-aminoalcohols with ketones. In particular, complex Mo(CO)6 in combination with Xantphos and t-BuOK as base provides directsynthesis of structurally diverse quinoline, pyridine, and pyrrole compounds (total 55 examples) with isolated yields up to 92%. Low catalyst loading, cost-effective