salicylaldehyde derivatives in the presence of a base, such as potassium t-butoxide or triethylamine, was found to give two extremely different kinds of products: 1-acetyl-3-arylmethylene-PDO and 3-(acylamino)coumarin derivatives. The former, which has a (Z)-geometric structure, was readily converted to the latter by irradiation. Furthermore, the conversion mechanism and the structural confirmation are
发现 1,4-
二乙酰或 3-取代的 2,5-
哌嗪二酮 (
PDO) 与各种
水杨醛衍
生物在碱(如
叔丁醇钾或
三乙胺)存在下的缩合反应产生两种截然不同的产品:1-乙酰基-3-芳基亚甲基-
PDO和3-(酰
氨基)
香豆素衍
生物。前者具有 (Z) 几何结构,通过辐照很容易转化为后者。此外,还讨论了转换机制和结构确认。