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A Convenient Metal-Free Synthesis of (E)-3-Styrylisocoumarins through Annulation of (E)-1,4-Diarylenynes

Guangkuan Zhao,Ling-Zhi Yuan,Mylène Roudier,Jean-François Peyrat,Abdallah Hamze,Jean-Daniel Brion,Olivier Provot,Mouad Alami

SYNTHESIS-STUTTGART（2016）

Cited 7|Views9
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Abstract
A metal-free procedure for the cyclization of (E)-1,4-diarylenynes is described. The reaction is promoted by a catalytic amount of p-toluenesulfonic acid and takes place in ethanol at 160 degrees C under microwave irradiation to afford stereoselectively (E)-3-styrylisocoumarins in good to excellent yields.
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Key words
styrylisocoumarins,cyclization,enynes,p-toluenesulfonic acid,Suzuki couplings
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