利用叶绿素选择性 PET 和 EnT 催化合成 N-烷基化喹啉-2(1H)-酮、异喹啉-1(2H)-酮和 1,2,4-三恶烷
摘要:
分别通过选择性光诱导电子转移(PET)和能量转移(EnT)实现了喹啉-2(1 H )-酮、异喹啉-1(2 H )-酮和1,2,4-三恶烷的光催化合成,由叶绿素在可见光照射下产生。喹啉-2(1 H )-酮、异喹啉-1(2 H )-酮和1,2,4-三恶烷是具有生物活性的支架,其遵循温和反应方案的合成受到高度追捧。这项工作展示了叶绿素的不同光催化作用,即喹啉或异喹啉的电子转移以及以烯丙醇为底物的能量转移,在绿色反应条件下提供有氧氧化。机理研究证实,催化循环遵循电子转移途径来进行N-烷基(异)喹啉鎓盐的氧化。此外,该方法为(N)-杂环的有机转化提供了一种环境友好、简单的反应策略。
Covalent Organic Frameworks toward Diverse Photocatalytic Aerobic Oxidations
作者:Shuyang Liu、Miao Tian、Xiubin Bu、Hua Tian、Xiaobo Yang
DOI:10.1002/chem.202100398
日期:2021.5.17
two‐dimensional covalentorganicframeworks (2D‐COFs) have become promising heterogenous photocatalysts in visible‐light‐drivenorganic transformations. Herein, a visible‐light‐driven selective aerobic oxidation of various small organic molecules by using 2D‐COFs as the photocatalyst was developed. In this protocol, due to the remarkable photocatalytic capability of hydrazone‐based 2D‐COF‐1 on molecular
transformation. This reaction features ambient air as the sole oxidant and oxygen source, a broad substrate scope, and excellent functional-group tolerance and proceeds under mild reaction conditions. Furthermore, a highly efficient synthesis of bioactive molecules and natural products including N-methylcrinasiadine, N-isopentylcrinasiadine, N-phenethylcrinasiadine, isoindolo[2,1-b]isoquinolin-5(7H)-one, PJ-34,
Visible-Light-Mediated Aerobic Oxidation of <i>N</i>-Alkylpyridinium Salts under Organic Photocatalysis
作者:Yunhe Jin、Lunyu Ou、Haijun Yang、Hua Fu
DOI:10.1021/jacs.7b07883
日期:2017.10.11
Quinolones and isoquinolones exhibit diverse biological and pharmaceutical activities, and their synthesis is highly desirable under mild conditions. Here, a highly efficient and environmentally friendly visible light-mediated aerobic oxidation of readily available N-alkylpyridinium salts has been developed with Eosin Y as the organic photocatalyst and air as the terminal oxidant, and the reaction
Radical cyclizations to quinolone and isoquinolone systems under oxidative and reductive conditions
作者:Yazmin M. Osornio、Luis D. Miranda、Raymundo Cruz-Almanza、Joseph M. Muchowski
DOI:10.1016/j.tetlet.2004.01.123
日期:2004.3
Radical cyclizations to quinolone and isoquinolone systems under Fenton-type and n-Bu3SnH-mediated conditions are described. For N-iodoalkylquinolones, ca. 3:1 mixtures of oxidative cyclization products at C-2, and unexpectedly at C-8, were obtained under both conditions. Five- or six-membered oxidative cyclization products were obtained from N-iodoalkylisoquinolones under Fenton-type conditions, whereas
In contrast with their oxo-analogues, thioenamides undergo photochemical cyclization to yield isoquinolinethione derivatives which are easily converted into isoquinolones and tetrahydroisoquinolines by treatment with benzeneseleninic anhydride and EtO3BF4–NaBH4, respectively.