Visible-Light-Induced Oxazoline Formations from <i>N</i>-Vinyl Amides Catalyzed by an Ion-Pair Charge-Transfer Complex
作者:Rui Sun、Xiao Yang、Yicen Ge、Jintong Song、Xueli Zheng、Maolin Yuan、Ruixiang Li、Hua Chen、Haiyan Fu
DOI:10.1021/acscatal.1c01755
日期:2021.9.17
catalysis which often involves transition-metal complexes, conjugated organic dyes, or electrondonor–acceptorcomplexes, herein, the use of ion-pair charge-transfer (IPCT) complex-induced visible-light photoredox catalytic reactions are described, wherein the cyclization–methoxylation of N-vinyl amides in methanol was achieved under irradiation with blue LEDs. The reaction employs a heteroarenium iodide
Anodic methoxylation and acetoxylation of imines and imidates
作者:Daisuke Baba、Toshio Fuchigami
DOI:10.1016/s0040-4039(03)00548-3
日期:2003.4
Anodic oxidation of cyclic imidates, 2-aryl-2-oxazolines, in methanol provided the corresponding 4-methoxylated products. Anodic α-methoxylation and α-acetoxylation of open-chain imines derived from glycine esters and benzophenone were also achieved using a bromide ion mediator. On the other hand, anodic α-acetoxylation of CF3-containing imine and imidate was successful without use of the bromine mediator
4-alkoxy-2-oxazolines. The proposed reaction mechanism has been validated by quantum chemistry calculations, key intermediate synthesis, and NMR spectra. Substituted 4-alkoxy-2-oxazolines have been synthesized via the reaction of nitriles with beta-hydroxyacetals promoted by trifluoromethanesulfonic acid. The reaction is proposed to be initiated by the protonation of the acetals to produce carbocations that are then