choice of the organic chromophore as the photocatalyst. The central photoredoxcatalyticreaction in both cases is a nucleophilic addition of the hydroxy function to the olefin function of the substrates. N,N-(4-Diisobutylaminophenyl)phenothiazine catalyzes exo-trig cyclizations, whereas 1,7-dicyanoperylene-3,4,9,10-tetracarboxylic acid bisimides catalyze endo-trig additions to products with anti-Markovnikov
Substituted pyrimidin-5-yl derivatives of L-glutamic acid are anti-neoplastic agents. A typical embodiment is N-4-[6-(2,6-diamino-4-hydroxypyrimidin-5-yl)hex-1-en-3-yl]benzoyl}-L-glut amic acid.
A visible-light mediated exclusively regioselective synthesis of 2,2-disubstituted thio-functionalized tetrahydrofurans, tetrahydro- pyrans and oxepanes has been described through an operationally simple and mild photoredox protocol. Thiyl radical generated from N-phenylsulfenyl phthalimide by photoredox catalysis was proven to be the key reactive intermediate in this reaction.
A facile electrochemical sulfonylative cycloetherification of linear unsaturated alcohols with sulfonyl hydrazides under mild conditions has been accomplished. This catalyst- and oxidant-free protocol proceeds via electro-oxidation, followed by radicaladdition, as well as an intramolecular oxygen nucleophilic process. This methodology is compatible with a broad substrate scope and good functional
Direct synthesis of unnatural amino acids and modifications of peptides via LADA strategy
作者:Yunqi Liu、Junliang Zhou、Zhankui Sun
DOI:10.1016/j.cclet.2023.108553
日期:2024.1
Unnatural amino acids (UAAs) have broad applications in pharmaceutical sciences and biological studies. Current synthetic methods for UAAs mainly rely on asymmetric catalysis and often require several steps. There is a lack of direct and simple methods. To address this challenge, we designed the LADA (labeling-activation-desulfurization-addition) strategy: selective labeling and activation of cysteine