A palladium-catalyzed, iodine-mediatedelectrophilicannulation between 2-(1-alkynyl)biphenyl and disulfide has been developed. With the combination of PdCl2 and I2, a variety of 2-(1-alkynyl)biphenyls underwent electrophilicannulations with various disulfides successfully to afford the corresponding 9-sulfenyl phenanthrenes in moderate to excellent yields.
BF<sub>3</sub> ⋅ Et<sub>2</sub>O‐Mediated Annulation of 2‐Alkynyl Biaryls with <i>N</i>‐(Arylthio) Succinimides: An Efficient Approach to Access 9‐Sulfenylphenanthrenes
A simple and effective method for the synthesis of 9-sulfenylphenanthrenes was developed. The reaction proceeds through BF3 ⋅ OEt2-mediated annulation of 2-alkynyl biaryls with N-arylthio succinimides at roomtemperature. With this method, a series of 9-sulfenylphenanthrenes was efficiently obtained in good to excellent yields under mild and metal-free conditions.
Synthesis of Fluoro- and Perfluoroalkyl Arenes via Palladium-Catalyzed [4 + 2] Benzannulation Reaction
作者:Olga V. Zatolochnaya、Vladimir Gevorgyan
DOI:10.1021/ol401057z
日期:2013.5.17
Pd-catalyzed [4 + 2] cross-benzannulation is presented. The synthetic utility of these products for the synthesis of various aromatic and heteroaromatic compounds is also demonstrated. This strategy offers a viable and quite general alternative to existing fluorination and perfluoroalkylation methods for securing these valuable molecules.
10 mA in an undivided cell setup by utilizing CH3CN as a solvent and LiClO4 as an electrolyte at room temperature. Notably, the present strategy enabled the formation of sulfenylphenanthrenes and sulfenyl spiro cyclohexa[4.5]trienones in 70%–95% yield. Scale-up synthesis, mechanistic studies, and cyclic voltammetry have also been carried out.