Diazepines. Part V. 2,3-Dihydro-1H-1,4-diazepines
作者:Douglas Lloyd、Ronald H. McDougall、Donald R. Marshall
DOI:10.1039/j39660000780
日期:——
open-chain condensation products result. Glycinamide reacts with acetyl-acetone to give an azomethine rather than a diazepine. Perhydro-1,4-diazepine could not be dehydrogenated to a dihydrodiazepine. The 2,3-dihydro-1H-1,4-diazepinium cation is very stable, as evinced by the pK values of the diazepine and by its relative stability to permanganate oxidation.
当将β-二酮和脂肪族1,2-二胺的等摩尔混合物在乙酸中加热时,会形成2,3-二氢-1 H -1,4-二氮杂derivatives衍生物。但是,如果将这些反应物的2:1混合物保持在室温下(无论是在醇中还是在无溶剂中),都将产生开链缩合产物。甘氨酰胺与乙酰丙酮反应生成偶氮甲碱而不是二氮杂pine。过氢的1,4-二氮杂pine不能脱氢成二氢二氮杂pine。2,3-二氢-1 H -1,4-二氮杂吡啶鎓阳离子非常稳定,这是由二氮杂的p K值及其对高锰酸盐氧化的相对稳定性所证明的。