Biomimetic asymmetric reduction of 2-functionalized quinolines has been successfully developed with the chiral and regenerable NAD(P)H model CYNAM in the presence of transfer catalyst simple achiral phosphoric acids, providing the chiral 2-functionalized tetrahydroquinolines with up to 99% ee. Using this methodology as a key step, a chiral and potent opioid analgesic containing a 1,2,3,4-tetrahydroquinoline
Facile Construction of Quinoline-2-carboxylate Esters through Aerobic Oxidation of Alkyl 4-Anilinocrotonates Induced by a Radical Cation Salt
作者:Xiaodong Jia、Pengfei Li、Yu Shao、Yu Yuan、Wentao Hou、Xiaofei Liu、Xuewen Zhang、Honghe Ji
DOI:10.1002/asia.201700560
日期:2017.7.18
aerobic oxidation of alkyl 4‐anilinocrotonates is described. In the presence of dioxygen, sp3 C−H bonds in 4‐anilinocrotonates can easily be oxidized by using a catalytic amount of a radicalcationsalt, providing a radical intermediate. After further oxidation and domino cyclization, the desired quinoline derivatives were afforded in high yields. This reaction provides a new way to construct the pharmaceutically
One-pot synthesis of heteroaromatic acetals via selectfluor-mediated tandem reaction of methyl quinoline-2-carboxylate and methanol
作者:Wengui Wang、Zhenqiang Chen、Yingying Zhang、Wei Zeng、Shoufeng Wang
DOI:10.1016/j.tet.2021.132607
日期:2022.1
report a mild Ag-catalyzed domino acetalization reaction using quinoline-2-carboxylates, which were substructures in a number of natural products. Methanol was directly utilized as the source of the acetal part. The main features of the dominoreaction include the Minisci reaction, oxidation, and acetalization. Hydrogen fluoride generated in-situ participates in the Minisci reaction, and no external acids
在这里,我们报告了使用 quinoline-2-carboxylates 的温和 Ag 催化的多米诺缩醛化反应,它是许多天然产物的亚结构。甲醇直接用作缩醛部分的来源。多米诺骨牌反应的主要特征包括 Minisci 反应、氧化和缩醛化。原位产生的氟化氢参与Minisci反应,无需外加酸。这种多米诺骨牌反应为在温和条件下使用甲醇生成杂芳族缩醛提供了一种简单而通用的途径,具有良好的官能团耐受性。
electrolysis setup gives rise to divergent siteselectivity: a divided electrochemical cell leads to C5-carboxylation, whereas an undivided cell promotes C4-carboxylation. The undivided cell reaction is proposed to operate via a paired electrolysis mechanism9,10, wherein both cathodic and anodic events play critical roles in altering the siteselectivity. Specifically, anodically-generated iodine preferentially