Author/Authors :
Cenini، نويسنده , , Sergio and Cravotto، نويسنده , , Giancarlo and Giovenzana، نويسنده , , Giovanni B and Palmisano، نويسنده , , Giovanni and Penoni، نويسنده , , Andrea and Tollari، نويسنده , , Stefano، نويسنده ,
Abstract :
In the presence of 3 mol% of [Ru(OAc)2]2 at 90°C in hexafluorobenzene or alcohols as solvents the highly stabilized diazocoumarin 1 undergoes insertion into the OH bond of alcohols (and phenols) regio- and chemoselectively, affording the corresponding 3-alkoxy-4-hydroxycoumarin in moderate to excellent yields.