C(sp2)–H/O–H cross-dehydrogenative coupling of quinoxalin-2(1H)-ones with alcohols under visible-light photoredox catalysis

Comparison of Fe2TiO5/C photocatalysts synthesized via a nonhydrolytic sol–gel method and solid-state reaction method

“…35 In addition, it is worth noting that Fe-O-Ti bond appears in the III-FeOH(CH 3 COO) 2 , 36 which demonstrates the occurrence of heterogeneous polycondensation in gel using FeOH(CH 3 COO) 2 as iron precursor, as shown in reaction eqn (7). Meanwhile, in the FTIR spectrum of II-Fe(OEt) 3 , a weak absorption peak located at 629 cm À1 is ascribed to the stretching vibration of Fe-O-Ti bond, indicating the occurrence of reaction eqn (8). The peak at 1100 cm À1 shows stretching vibrations of C-O-C bond in C 4 H 9 OC 2 H 5 .…”

“…5,6 It is known that inexhaustible solar energy is the most ideal candidate for energy source. Thus, visible-light photocatalysis has received great attention in environmental remediation, which includes organic photocatalysts [7][8][9] and inorganic photocatalysts. Xie et al developed visible-light-induced deoxygenative C2sulfonylation of quinoline N-oxides with sulnic acids and C(sp 2 )-H/O-H cross-dehydrogenative coupling of quinoxalin-2(1H)-ones with alcohols using organic dyes as the catalysts.…”

“…Xie et al developed visible-light-induced deoxygenative C2sulfonylation of quinoline N-oxides with sulnic acids and C(sp 2 )-H/O-H cross-dehydrogenative coupling of quinoxalin-2(1H)-ones with alcohols using organic dyes as the catalysts. 7,8 Though researchers have had some achievements in the eld of organic photocatalysis, the inorganic photocatalysts have the merits of high efficiency, simplicity, good repeatability, and easy operation. 10 Therefore, heterogenous photocatalysis using inorganic materials as photocatalysts is oen used to degrade organic pollutants with reactive oxygen species (ROS) and.…”

Promising reagents for difluoroalkylation

“…Quinoxalin-2-one derivatives are useful molecules and appear in many bioactive molecules. [183][184][185][186] In 2019, a coppercatalyzed direct C-3 difluoroacetylation of quinoxalinones with ethyl bromodifluoroacetate was demonstrated by Zhang and coworkers (Scheme 91). 187 In 2019, the visible-light-and organoamine-cocatalyzed difluoroalkylation of quinoxalinones with functionalized difluoromethyl bromides was also realized by the Sun group (Scheme 92).…”

Metal-Free Direct C–H Functionalization of Quinoxalin-2(1H)-Ones to Produce 3-Vinylated Quinoxalin-2(1H)-Ones in the Presence of Alkenes

“…For Recent years have seen, the emergence of cross-dehydrocoupling (CDC) reaction, between two different molecules, as a prominent research topic (Girard et al, 2014;Huang et al, 2019;Mane et al, 2019;Liu et al, 2020;Xu et al, 2020). These reactions exploit the C-H bonds of various substrates, during the dehydrogenation coupling reactions under oxidizing reaction conditions, to form C-C bonds (Niu et al, 2015;Cheng et al, 2017;Yuan et al, 2018;Xie et al, 2020). The cross-dehydrocoupling reactions provide shorter synthetic routes and new research ideas for the direct and efficient synthesis of complex organic materials from simple raw materials.…”