A convenient photo-dehalogenation of α-haloketones was developed under irradiation with a purple LED. This simple method does not require any catalyst and water could act as the sole additive, affording efficiently the dehalogenated products with different substituents at room temperature in air atmosphere. Mechanistic study indicated that the ether solvent is also the photoreductant for the reaction
在紫色 LED 的照射下,开发了一种方便的 α-卤代酮光脱卤方法。这种简单的方法不需要任何催化剂,水可以作为唯一的添加剂,在室温和空气气氛中有效地提供具有不同取代基的脱卤产物。机理研究表明,醚类溶剂也是该反应的光还原剂,使用氘代溶剂可以实现酮产物的α-氘化。
Cascade Functionalization of C(sp<sup>3</sup>)–Br/C(sp<sup>2</sup>)–H Bonds: Access to Fused Benzo[<i>e</i>]isoindole-1,3,5-trione via Visible-Light-Induced Reductive Radical Relay Strategy
A reductive radical relay strategy for the construction of fused benzo[e]isoindole-1,3,5-trione through a reaction of alpha-bromo ketones with maleimides in the presence of Ir(ppy)(3) under visible-light irradiation is described. The protocol employs very mild reaction conditions and offers satisfactory yields. Moreover, the reaction proceeds through a cascade C(sp(3))-Br/C(sp(2))-H functionalization, double C-C bond formation, and oxidative aromatization sequence.
Rodygin, M. Yu.; Mikhailov, V. A.; Savelova, V. A., Russian Journal of Organic Chemistry, 1994, vol. 30, # 6.1, p. 881 - 887
作者:Rodygin, M. Yu.、Mikhailov, V. A.、Savelova, V. A.