A novel method for the synthesis of substituted naphthalenes and phenanthrenes
作者:Charles B. de Koning、Joseph P. Michael、Amanda L. Rousseau
DOI:10.1039/a908361h
日期:——
Heating of o-allyl-substituted acylbenzenes with potassium tert-butoxide in DMF with simultaneous irradiation from a high-pressure mercury lamp afforded substitutednaphthalenes, including arylnaphthalenes. 2-(o-Tolyl)-substituted aromatic aldehydes were converted into phenanthrenes under the same conditions. A formal synthesis of tanshinone I has also been achieved.
Application of intramolecular carbonyl-ene reaction towards the synthesis of idarubicinone scaffold
作者:Shyam Basak、Sutapa Ray、Dipakranjan Mal
DOI:10.24820/ark.5550190.p009.921
日期:——
facile access to the tetracyclic idarubicinone core. The required key dihydroxyanthraquinone aldehyde precursor was assembled in one step by modified Hauser annulation of a functionalized benzoquinone. Its ene reaction in the presence of SnCl4·5H2O directly led to the formation of idarubicinone core. Also described are an unprecedented thermal cascade involving a thermal ICE en route to α-naphthols, and
Intramolecular carbonyl-ene reactions in the synthesis of peri-oxygenated hydroaromatics
作者:Shyam Basak、Dipakranjan Mal
DOI:10.1016/j.tet.2016.02.033
日期:2016.4
Suzuki coupling of 2-formylphenylboronic acids, are shown to provide cycloalkylidene ene products under acidic conditions. Susceptibility of the products to aromatization is manoeuvred by varying the reaction conditions and catalysts including binol-derived Brønsted acid catalysts. A peri-effect is identified as a controlling factor for the aromatizations. Several oxidative transformations of an ene product
Intramolecular Hydroarylation of Arenes via Imidazole-Directed C–H Activation in Aqueous Methanol Using Rhodium(III) as the Catalyst and Mechanistic Study
作者:Nilotpal Sinha、Prasenjit Mistry、Sukanya Das、Tanmoy Datta、Brindaban Roy
DOI:10.1021/acs.joc.3c00689
日期:2023.7.7
A mild and greener approach for intramolecular regioselective hydroarylation is described for the efficient and elegant preparation of a number of dihydrobenzofurans and dihydrobenzo[b]thiophenes using imidazole as a directing group and Rh(III) as a catalyst. Moreover, the protocol may be extended to the formation of indoline and chromane derivatives. Deuterium scrambling experiments and characterization