Sequential Reduction and Dehydration of Phenacyl-(<i>E</i>)-Styryl Sulfones to Unsymmetrical (<i>E</i>,<i>E</i>)-Bis(styryl) Sulfones
作者:M. V. Reddy、Muralidhar Reddy Mallireddigari、Venkat R. Pallela、E. Premkumar Reddy
DOI:10.1055/s-2005-918450
日期:——
β-Keto vinylic sulfones, the key building blocks for the synthesis of the title compounds, were prepared by two different routes. NaBH4 reduction of these compounds afforded β-hydroxy vinylic sulfones which were dehydrated with acetic anhydride and BF3·Et2O to obtain bis(styryl) sulfones. Alternatively, one-pot synthesis of these bis(styryl) sulfones was also achieved directly from β-keto vinylic sulfones by treating with NaBH4 in EtOH followed by refluxing with concentrated HCl.