desulfonylation upon acetolysis of the oxathiazinane ring to give 43 in good yield. The amine obtained by selective removal of the Cbz group of the alcohol 44 was reacted with MeSC(═O)-l-Val-O-t-Bu (38) to provide 45, which was oxidized to the carboxylic acid 46. Reaction of 46, isonitrile 51, isovaleraldehyde, and 2,4-dimethoxybenzylamine furnished the desired Ugi products, the final deprotection of which successfully
Synthesis and evaluation of cyclopentane-based muraymycin analogs targeting MraY
作者:Seung-Hwa Kwak、Won Young Lim、Aili Hao、Ellene H. Mashalidis、Do-Yeon Kwon、Pyeonghwa Jeong、Mi Jung Kim、Seok-Yong Lee、Jiyong Hong
DOI:10.1016/j.ejmech.2021.113272
日期:2021.4
we prepared and evaluated cyclopentane-based muraymycin analogs for targeting MraY. For the installation of the 1,2-syn-amino alcohol group of analogs, the diastereoselective isocyanoacetate aldol reaction was explored. The structure–activity relationship analysis of the synthesized analogs suggested that a lipophilic side chain is essential for MraY inhibition. Importantly, the analog 20 (JH-MR-23)
It is urgent to develop novel anti-Pseudomonas agents that should also be active against multidrug resistant P. aeruginosa. Expanding the antibacterial spectrum of muraymycins toward P. aeruginosa was investigated by the systematic structure activity relationship study. It was revealed that two functional groups, a lipophilic side chain and a guanidino group, at the accessory moiety of muraymycins were important for the anti-Pseudomonas activity, and analogue 29 exhibited antibacterial activity against a range of P. aeruginosa strains with the minimum inhibitory concentration values of 4-8 mu g/mL.
Phosphine‐Catalyzed Synthesis of Chiral
<i>N</i>
‐Heterocycles through (Asymmetric) P(III)/P(V) Redox Cycling
作者:Charlotte Lorton、Nidal Saleh、Arnaud Voituriez
DOI:10.1002/ejoc.202100404
日期:2021.6.14
Wittig reactions have been developed for the synthesis of chiral 2,5-dihydro-1 H -pyrrole and tetrahydropyridine derivatives. These processes have been rendered catalytic in phosphine, thanks to the in situ reduction of phosphine oxide by phenylsilane. Furthermore, catalytic and asymmetric P(III)/P(V) processes were implemented using enantiopure chiral phosphines.
A novelspidertoxin, NPTX-594, comprised of four constituents: i.e., 2,4-dihydroxyphenylacetic acid (Dhpa), asparagine, 4,8-diaza-1,12-dodecanediamine (Dada), and lysine, was chemically synthesized. The synthetic compound was completely identical with the natural product as regards 1H NMR and mass spectra. The structure of NPTX-594 was thus determined synthetically to be N12-(Dhpa-Asn)-N1-Lys-Dada