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.
δ²-酮乙烯基砜是合成标题化合物的关键构件,通过两种不同的方法制备。用 NaBH4 还原这些化合物可得到δ-羟基乙烯基砜,再用乙酸酐和 BF3-Et2O 脱水可得到双(苯乙烯基)砜。另外,还可以直接从δ-酮乙烯基砜单锅合成这些双(苯乙烯基)砜,方法是在 EtOH 中用 NaBH4 处理,然后用浓盐酸回流。