Acid anhydrides and the unexpected N,N-diethylamides derived from the reaction of carboxylic acids with Ph3P/I2/Et3N
作者:Wong Phakhodee、Chuthamat Duangkamol、Sirilak Wangngae、Mookda Pattarawarapan
DOI:10.1016/j.tetlet.2015.12.009
日期:2016.1
high yields within 5–10 min. However, for nitro-substituted derivatives, unexpectedly, N,N-diethylamides were isolated without anhydride formation. These results indicated the pronounced effect of substituents in governing these potential side reactions which can significantly affect the yields of acylation reactions promoted by phosphonium species.
研究了由磷介导的羧酸活化作用形成酸酐。在各种体系下,取决于试剂的反应性,在碱的存在下苯甲酸的活化导致苯甲酸酐以不同的速率形成。使用Ph 3 P–I 2 / Et 3 N组合,大多数芳酸在5–10分钟内即可高产率转化为相应的酸酐。然而,对于硝基取代的衍生物,出乎意料的是,N,N分离了-二乙酰胺而没有酸酐形成。这些结果表明取代基在控制这些潜在的副反应中具有显着的作用,其可显着影响由phospho物种促进的酰化反应的产率。