Aerobic α‐Oxidation of N‐Substituted Tetrahydroisoquinolines to Dihydroisoquinolones via Organo‐photocatalysis
作者:Kim Aganda、Boseok Hong、Anna Lee
DOI:10.1002/adsc.201801301
日期:——
An efficient visible‐light‐induced α‐oxidation of N‐substituted tetrahydroisoquinolines to dihydroisoquinolones has been developed using eosinY as an organo‐photocatalyst and oxygen as a green oxidant. The reactions were carried out under mild reaction conditions; the desired dihydroisoquinolones were obtained in up to 96% yield at room temperature under oxygen atmosphere. This transformation provides
Reactions Catalysed by a Binuclear Copper Complex: Relay Aerobic Oxidation of <i>N</i>
-Aryl Tetrahydroisoquinolines to Dihydroisoquinolones with a Vitamin B1 Analogue
N‐Aryl tetrahydroisoquinolines were oxidised to dihydroisoquinolones through the relay catalysis of a binuclear paddle‐wheel coppercomplex and a vitaminB1analogue with oxygen as oxidant. Mechanistic studies revealed that the copper catalyst oxidises amines to the corresponding iminium salts, which are then oxygenated to lactam products by catalysis of the vitaminB1analogue.
Porphyrin-Catalyzed Oxidation of N-Substituted Tetrahydroisoquinolines to Dihydroisoquinolones
作者:Ao Li、Bin Pan、Yu-Long Li、Qin Ouyang、Chao Mu、Na Wang
DOI:10.1055/a-1345-3491
日期:2021.4
A visible-light-induced direct α-oxygenation of N-substituted 1,2,3,4-tetrahydroisoquinoline derivatives has been successfully developed. Tetraphenylporphyrinatozinc(II) has been identified as an effective and inexpensive photocatalyst for this transformation with a wide range of substrates. This protocol provides a convenient route to the desired products in moderate to good yields at room temperature
Oxidation of the inert sp<sup>3</sup>C–H bonds of tetrahydroisoquinolines through C–H activation relay (CHAR): construction of functionalized isoquinolin-1-ones
α-phosphoric ester group is crucial to enable dioxygen trapping and intramolecular HAT (C–H activation relay, CHAR), realizing the synthesis of a series of isoquinolin-1-ones in high yields. The mechanistic study confirmed that the formation of the 3,4-double bond is mediated by the CHAR process. This work provides a new strategy to achieve remote C–H bond activation.
TBN / O 2引发的THIQs相对惰性3,4-C–H键的氧化得以完成,其中α-磷酸酯基的存在对于实现双氧捕获和分子内HAT(CH活化)至关重要继电器CHAR),实现了高产量地合成一系列异喹啉-1-酮。机理研究证实3,4-双键的形成是由CHAR过程介导的。这项工作提供了一种实现远程C–H键激活的新策略。
Multifunctionalization of C(sp
<sup>3</sup>
)−H Bond of Tetrahydroisoquinolines through C−H Activation Relay (CHAR) Using α‐Cyanotetrahydroisoquinolines as Starting Materials
Using α-cyanotetrahydroisoquinolines as the startingmaterials, a TBN/O2 initiated C(sp3)−Hbondmultifunctionalization was developed, realizing the construction of the isoquinolin-1-one skeleton. This work revealed that the functionalization of the relatively inert C−Hbond could be induced by a radical C−Hactivationrelay (CHAR) process.