Base-Induced Photocyclization of 1,2-Diaryl-1-tosylethenes. A Mechanistically Novel Approach to Phenanthrenes and Phenanthrenoids
作者:Jesús F. Almeida、Luis Castedo、Dolores Fernández、Ana G. Neo、Víctor Romero、Gabriel Tojo
DOI:10.1021/ol0357954
日期:2003.12.1
phenanthrenes and heterocyclic analogues. These results are consistent with a mechanism involving the base-induced elimination of p-toluenesulfinic acid from an intermediate 9-tosyl-4a,4b-dihydrophenanthrene, formed by photochemical cyclization of the starting 1,2-diaryl-1-tosylstilbenes. [reaction: see text]
Preparation of Phenanthrenes by Photocyclization of Stilbenes Containing a Tosyl Group on the Central Double Bond. A Versatile Approach to the Synthesis of Phenanthrenes and Phenanthrenoids
作者:Ana G. Neo、Carmen López、Victor Romero、Berta Antelo、José Delamano、Antonio Pérez、Dolores Fernández、Jesús F. Almeida、Luis Castedo、Gabriel Tojo
DOI:10.1021/jo100742e
日期:2010.10.15
modification of the classical preparation of phenanthrenes by UV irradiation of stilbenes in the presence of an oxidant. This modification involves the irradiation, in the presence of base, of stilbenes possessing a sulfonyl group linked to the central double bond. We have proved that this protocol can be successfully applied for the synthesis of diverse phenanthrenes and phenanthrenoids.