作者:Wayne Vuong、Fabricio Mosquera-Guagua、Randy Sanichar、Tyler R. McDonald、Oliver P. Ernst、Lei Wang、John C. Vederas
DOI:10.1021/acs.orglett.9b04216
日期:2019.12.20
Spin-labeled aminoacids (SLAAs) are often used to determine intermolecular distances and conformations in proteins via double electron-electron resonance. Currently available SLAAs can be difficult to incorporate selectively and have little resemblance to natural side chains in proteins. Enantioselective synthesis of three spin-labeled l-amino acids is described, starting from readily available 2
Preparation of labeled aromatic amino acids <i>via</i> late-stage <sup>18</sup>F-fluorination of chiral nickel and copper complexes
作者:Austin Craig、Niklas Kolks、Elizaveta A. Urusova、Johannes Zischler、Melanie Brugger、Heike Endepols、Bernd Neumaier、Boris D. Zlatopolskiy
DOI:10.1039/d0cc02223c
日期:——
A general protocol for the preparation of 18F-labeled AAAs and α-methyl-AAAs applying alcohol-enhanced Cu-mediated radiofluorination of Bpin-substituted chiral complexes using Ni/Cu-BPX templates as double protecting groups is reported. The chiral auxiliaries are easily accessible from commercially available starting materials in a few synthetic steps. The versatility of the method was demonstrated
Purely Chemical Approach for Preparation of<scp>d</scp>-α-Amino Acids via (<i>S</i>)-to-(<i>R</i>)-Interconversion of Unprotected Tailor-Made α-Amino Acids
作者:Yong Nian、Jiang Wang、Shengbin Zhou、Wenhao Dai、Shuni Wang、Hiroki Moriwaki、Aki Kawashima、Vadim A. Soloshonok、Hong Liu
DOI:10.1021/acs.joc.5b02707
日期:2016.5.6
Unnatural (R)-α-amino acids (α-AAs) are in growing demand in the biomedical research and pharmaceutical industries. In this work, we present development of a purely chemical approach for preparation of (R)-α-AAs via (S)-to-(R)-interconversion of natural and tailor-made (S)-α-AAs. The method can be used on free, unprotected α-AAs and features a remarkable structural generality including substrates bearing
Recyclable Ligands for the Non‐Enzymatic Dynamic Kinetic Resolution of Challenging α‐Amino Acids
作者:Yong Nian、Jiang Wang、Shengbin Zhou、Shuni Wang、Hiroki Moriwaki、Aki Kawashima、Vadim A. Soloshonok、Hong Liu
DOI:10.1002/anie.201507273
日期:2015.10.26
tridentate ligands were employed for substantially advancing the purely chemical dynamickineticresolution (DKR) of unprotected racemic tailor‐made α‐aminoacids (TM‐α‐AAs), enabling the first DKR of TM‐α‐AAs bearing tertiary alkyl chains as well as multiple unprotected functional groups. Owing to the operationally convenient conditions, virtually complete stereoselectivity, and full recyclability of the
A Convergent Total Synthesis of the Death Cap Toxin α‐Amanitin
作者:Mary‐Ann J. Siegert、Caroline H. Knittel、Roderich D. Süssmuth
DOI:10.1002/anie.201914620
日期:2020.3.27
α-amanitin from mushrooms as the sole source severely restricts compound supply as well as further investigations, as structure-activityrelationship (SAR) studies. Based on a straightforward access to the non-proteinogenic amino acid dihydroxyisoleucine, we herein present a robust total synthesis of α-amanitin providing options for production at larger scale as well as future structural diversifications.