Oxa-ene Reaction of Enols of Amides with 4-Phenyl-1,2,4-triazoline-3,5-dione
作者:Ahmad Basheer、Zvi Rappoport
DOI:10.1021/jo702083u
日期:2008.1.1
The reaction of 16 enols of amides with 4-phenyl-1,2,4-triazoline-1,3-dione gave open chain adducts rather than the [2 + 2] cycloadducts with a hemiaminal moiety, both in solid state and in solution. This assignment is based on X-ray crystallography, 1H and 13C NMR data, and IR spectra. The suggested mechanism involves hydroxyl proton loss in a formal oxa-ene reaction. Mechanistic details and a possible
16种酰胺的烯醇与4-苯基-1,2,4-三唑啉-1,3-二酮的反应生成开环加合物,而不是具有氨基部分的[2 + 2]环加合物,无论是在固态还是在溶液中。该分配基于X射线晶体学,1 H和13 C NMR数据以及IR光谱。所建议的机理涉及在正式的氧杂-烯反应中羟基质子损失。讨论了机械细节和可能的替代方法。