Structure-reactivity relationships of alkyl α-hydroxymethacrylate derivatives
作者:Ozlem Karahan、Duygu Avci、Vİktorya Avİyente
DOI:10.1002/pola.24743
日期:2011.7.15
A series of alkyl α‐hydroxymethacrylate derivatives with various secondary functionalities (ether, ester, carbonate, and carbamate) and terminal groups (alkyl, cyano, oxetane, cyclic carbonate, phenyl and morpholine) were synthesized to investigate the effect of intermolecular interactions, H‐bonding, π–π interactions, and dipole moment on monomer reactivity. All of the monomers except one ester and
An efficient silver-catalyzed method of decarboxylative radical allylation of α,α-difluoroarylacetic acids to build CF2–allyl bonds has been developed. Using allylsulfone as an allyl donor, α,α-difluorine substituted arylacetic acids bearing various functional groups are successfully allylated to access a series of 3-(α,α-difluorobenzyl)-1-propylene compounds in moderate to excellent yields in aqueous
Site‐Selective Itaconation of Complex Peptides by Photoredox Catalysis
作者:Siyao Wang、QingQing Zhou、Xiaheng Zhang、Ping Wang
DOI:10.1002/anie.202111388
日期:2022.1.26
Photoredox catalysis has emerged as a powerful approach for site-selective peptide functionalization. Herein, we report a highly N-termini-specific method to rapidly access itaconated peptide derivatives under mild photoredox conditions. Distinct from conventional methods that rely on residue nucleophilicity, this method proceeds through a highly reactive carbamoyl radical intermediate to achieve excellent
Enantioselective synthesis of (S)-4-methyleneglutamic acid via tandem conjugate addition–elimination under phase-transfer catalytic conditions
作者:Sukhoon Kang、Qinghua Shi、Min Woo Ha、Jin-Mo Ku、Maosheng Cheng、Byeong-Seon Jeong、Hyeung-geun Park、Sang-sup Jew
DOI:10.1016/j.tet.2010.04.034
日期:2010.6
An efficient enantioselective synthetic method for (S)-4-methyleneglutamic acid is reported. Phase-transfer catalytic conjugate addition elimination of the benzophenone imine of glycine tert-butyl ester in the presence of chiral Cinchona-derived catalysts give the corresponding conjugated addition products (>99% ee), which could be hydrolyzed to chiral (S)-4-methyleneglutamic acid. (C) 2010 Elsevier Ltd. All rights reserved.