Photoinduced cyclization of alkynoates to coumarins with N-Iodosuccinimide as a free-radical initiator under ambient and metal-free conditions
作者:Zhihui Wang、Xuezhi Li、Lei Wang、Pinhua Li
DOI:10.1016/j.tet.2019.01.013
日期:2019.2
a free-radical initiator and under LED (380–385 nm) irradiation and metal-free conditions, the reaction of alkynoates underwent smoothly to afford the corresponding coumarins in high yields at room temperature with broad substrate scope via free radical intramolecular cyclization and ester rearrangement.
开发了一种有效的光诱导香豆素制备方法。在存在N-碘代琥珀酰亚胺(NIS)作为自由基引发剂的情况下,并在LED(380-385 nm)辐射和无金属条件下,炔酸的反应平稳进行,从而在室温下以高收率提供了相应的香豆素。通过自由基分子内环化和酯重排,可扩大底物范围。