Oxidative amidation of benzyl alcohols with amino acid esters mediated by <i>N</i>-hydroxysuccinimide/phenyliodine diacetate
作者:Mandipogula Mahesh、Veladi Panduranga、Girish Prabhu、Roopesh Kumar L、P. Venkata Ramana、Vommina V. Sureshbabu
DOI:10.1080/00397911.2017.1281960
日期:2017.4.3
amidation of benzyl alcohols with amino acid esters has been presented. The amidation proceeds in a radical pathway unlike in conventional metal-mediated extrusion of dihydrogen. The method is advantageous in terms of metal-free conditions, nonexpensive commercial starting substrates. Also various substituents in the starting materials are tolerated and sterically hindered amino acid side chains could
work, a mild and transition‐metal‐free approach for the nucleophilic aromatic substitution (SNAr) of unactivated fluoroarenes with primary aliphatic amines to form aromatic amines is reported. This reaction is facilitated by the formation of cationic fluoroarene radical intermediates in the presence of an acridinium‐based organic photocatalyst under blue‐light irradiation. Various electron‐rich and
A facile synthesis of optically active C2-symmetric 2,5-disubstituted pyrrolidines and other β,β′-dihydroxyamines
作者:Kevin Koh、Robert N. Ben、T. Durst
DOI:10.1016/0040-4039(94)85057-7
日期:1994.1
has been converted into the di-(R)-pantolactone ester of (S,S)-pyyrolidine-2,5-dicarboxylic acid in two steps. This compound serves as a precursor to C2-symmetric2,5-disubstitutedpyrrolidines. The synthesis of linear C2-symmetricβ,β′-dihydroxyamines starting with α-bromophenylacetic acid and (S)-phenylglycine ethyl ester is also reported.
Comparative Studies on Enantiomer Resolution of α-Amino Acids and Their Esters Using (18-Crown-6)-tetracarboxylic acid as a Chiral Crown Ether Selector by NMR Spectroscopy and High-Performance Liquid Chromatography
作者:Eun-Jung Bang、Jing-Yu Jin、Joon-Hee Hong、Jong-Seong Kang、Weon-Tae Lee、Won-Jae Lee
DOI:10.5012/bkcs.2012.33.10.3481
日期:2012.10.20
18-2.74), except for leucine methylester and phenylalanine methylester (entries 2 and 3 in Table 2). However, all analytes including these two analytes showed chemical shift differences for the α-proton in the presence of 18-C-6-TA by NMRspectroscopy. It means that 18-C-6-TA successfully discriminated all tested amino acids and esters in this study by NMR. Typical H NMR spectra of valine (Val) and
Reactions of some copper(II) complexes of the Schiff bases of amino-acid esters
作者:R. D. Gillard、R. Wootton
DOI:10.1039/j29700000364
日期:——
is converted into the corresponding ethyl ester complex upon being heated in ethanol. Evidence was also found for the hydrolysis of this complex, and of the copper(II) complex of the tetradentate double Schiff-base formed between lysine ethyl ester and salicylaldehyde (1 : 2). The rapid racemisation of the complexes Cu(sal[graphic omitted]R)2 is shown to be a general reaction. The complexes Cu(sal[graphic