Visible light-promoted reductive transformations of various organic substances by using hydroxyaryl-substituted benzimidazolines and bases
作者:Eietsu Hasegawa、Norihiro Izumiya、Takuya Fukuda、Kazuki Nemoto、Hajime Iwamoto、Shin-ya Takizawa、Shigeru Murata
DOI:10.1016/j.tet.2016.05.078
日期:2016.12
effects on the progress of these reactions in a manner that depends on the nature of the substrate. Addition of 1,8-diazabicyclo[5.4.0]undec-7-ene as well as potassium t-butoxide significantly accelerates photo-reduction reactions of organohalides, sulfonamides and organonitriles while the decomposition of formed hydroxy ketones occurs in reactions of epoxy ketones. Single electron transfer from the
使用具有2-羟基萘基或2-羟基苯基取代基(HOAr-DMBIH)的1,3-二甲基苯并咪唑啉作为光还原剂,进行有机卤化物,磺酰胺,有机腈和环氧酮的可见光促进的还原反应。通过适当的玻璃滤光片(λ> 390 nm)的Xe或Hg–Xe灯和家用白色发光二极管用作光源。在这些反应中,发生了碳卤素,氮硫,碳碳(腈)和碳氧键的还原裂解。碱以取决于底物性质的方式对这些反应的进行产生重大影响。添加1,8-二氮杂双环[5.4.0]十一碳-7-烯以及钾t-丁氧化物可显着加速有机卤化物,磺酰胺和有机腈的光还原反应,而形成的羟基酮的分解则发生在环氧酮的反应中。(从苯并咪唑啉(HOAR-DMBIH)或它们的去质子化类似物的光激发态单电子转移-桨DMBIH)于基板,提出了以启动这些反应。