PIFA-Promoted, Solvent-Controlled Selective Functionalization of C(sp<sup>2</sup>)–H or C(sp<sup>3</sup>)–H: Nitration via C–N Bond Cleavage of CH<sub>3</sub>NO<sub>2</sub>, Cyanation, or Oxygenation in Water
作者:Chandrashekar Mudithanapelli、Lama Prema Dhorma、Mi-hyun Kim
DOI:10.1021/acs.orglett.9b00751
日期:2019.5.3
CH3NO2) mediated by [bis(trifluoroacetoxy)iodo]benzene (PIFA) is described. The NO2 transfer from CH3NO2 to the aromatic group of the substrate is possible with careful selection of the solvent, NaX, and oxidant. In addition, the solvent-controlled C(sp2)–H functionalization can shift to an α-C(sp3)–H functionalization (cyanation or oxygenation) of the α-C(sp3)–H of cyclic amines.
描述了由[双(三氟乙酰氧基)碘]苯(PIFA)介导的新型硝化作用(通过C(SP 3)–N破坏/ C(SP 2)–N与CH 3 NO 2形成)。的NO 2从CH转印3 NO 2到基板的芳族基团是可能的溶剂,的NaX,和氧化剂的仔细选择。此外,溶剂控制的C(SP 2)-H官能化可转移到一个α-C(SP 3)-H官能的α-C(SP的(氰化或氧合)3)-H的环胺。
α-Angelica Lactone in a New Role: Facile Access to <i>N</i>-Aryl Tetrahydroisoquinolinones and Isoindolinones via Organocatalytic α-CH<sub>2</sub> Oxygenation
作者:Thanusha Thatikonda、Siddharth K. Deepake、Utpal Das
DOI:10.1021/acs.orglett.9b00224
日期:2019.4.19
A method for the directoxidation of various N-aryl tetrahydroisoquinolines and isoindolines to the corresponding lactams using α-angelica lactone as a catalyst was developed. The utility of the method was further demonstrated by synthesis of indoprofen and indobufen.
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.