A highly regioselective reaction of<i>N</i>-fluoropyridinium salts with stabilized sulfur, oxygen, and nitrogen nucleophiles: A convenient route to 2-substituted pyridines
作者:Alexander S. Kiselyov、Lucjan Strekowski
DOI:10.1002/jhet.5570300530
日期:1993.10
2-Substitutedpyridines are efficiently obtained by the reactions of N-fluoropyridinium tetrafluoroborate or triflate with anions derived from benzenethiols, phenols, azoles, cyanamide, and with azide anion. The results are consistent with a nucleophile addition at the position 2 of the N-fluoropyridinium cation as the major reaction pathway.
CH Functionalization of Phenols Using Combined Ruthenium and Photoredox Catalysis: In Situ Generation of the Oxidant
作者:David C. Fabry、Meria A. Ronge、Jochen Zoller、Magnus Rueping
DOI:10.1002/anie.201408891
日期:2015.2.23
A combination of ruthenium and photoredox catalysis allowed the ortho olefination of phenols. Using visible light, the direct CH functionalization of o‐(2‐pyridyl)phenols occurred, and diverse phenol ethers were obtained in good yields. The regeneration of the ruthenium catalyst was accomplished by a photoredox‐catalyzed oxidative process.