Rearrangements in the cerium(IV) and manganese(III) oxidations of substituted naphthalenes and the NIH shift mechanism
作者:M.Vivekananda Bhatt、Mariappan Periasamy
DOI:10.1016/s0040-4020(01)87034-4
日期:1994.3
ammonium sulphate oxidation of 1- md 1,4- disubstituted naphthalenes gives 2- and/or 2,3- disubstituted 1,4- naphthoquinones through migration of substituents (D, Br, Ph). Similar rearrangements are also observed in the manganese(III) oxidation and also in the anodic oxidation of these substrates. The results are consistent with the proposal that these oxidations go through the formation of radical cation
Suitable heterogeneous sulfonic acid derivatives ensure the smooth dearomatization of phenols and bare naphthalenes under mild conditions. The method uses hydrogenperoxide which is a clean oxidant, offering a convenient metal-free tool to access families of quinones derivatives in good yields and with low catalyst loadings.
Overcoming naphthoquinone deactivation: rhodium-catalyzed C-5 selective C–H iodination as a gateway to functionalized derivatives
作者:Guilherme A. M. Jardim、Eufrânio N. da Silva Júnior、John F. Bower
DOI:10.1039/c6sc00302h
日期:——
Rh-catalyzed method for the C-5 selective C–H iodination of naphthoquinones and show that complementary C-2 selective processes can be achieved under related conditions. C–C bond forming derivatizations of the C-5 iodinated products provide a gateway to previously inaccessible A-ring analogues. The present study encompasses the first catalyticdirected ortho-functionalizations of simple (non-bias)
Visible Light‐Promoted, Photocatalyst‐Free C(sp
<sup>2</sup>
)−H Bond Functionalization of Indolizines
<i>via</i>
EDA Complexes
作者:Kishor D. Mane、Bapurao D. Rupanawar、Gurunath Suryavanshi
DOI:10.1002/ejoc.202200261
日期:2022.5.13
light-promoted, operationally simple, and mild reaction to construct functionally important derivatives of indolizine was developed. Interestingly, this photo-driven CDC transformation can go ahead without adding any photocatalyst or additive. In place of catalyst, the formation of EDA complex between indolizine and quinone drives this photochemical reaction.
Ru(II)-Catalyzed [4 + 2]-Annulation and Arylation of 1,4-Naphthoquinones
作者:Shreemoyee Kumar、Akshay M. Nair、Jatin Patra、Chandra M. R. Volla
DOI:10.1021/acs.orglett.3c00033
日期:2023.2.24
4-naphthoquinones with organic building blocks would offer a facile strategy toward scaffolds of biological interest. In this regard, we hereby report a Ru(II)-catalyzed [4 + 2] annulation of 1,4-naphthoquinones with benzoic acids to afford various naphthoquinone lactones. Additionally, ketone directed arylation of naphthoquinones using acetophenones underRu(II)-catalysis was also illustrated. The feedstock