A mixture of D-alloisoleucine and L-isoleucine derivatives are selectively hydrolysed by enzymatic catalysis (alcalase) allowing the recovery of the D-allo stereoisomer in excellent d.e. and yields. Thus, N-formyl-D-allo-isoleucine benzylester is obtained after enzymatic hydrolysis of the diastereoisomeric mixture or by a crystallisation procedure. (C) 2003 Elsevier Ltd. All rights reserved.
Aminopropylated mesoporous SBA-15 silica (APMS) is introduced as a new, recyclable and efficient catalyst for the formylation of a variety of amines and alcohols by using readily available formic acid under solvent-free conditions.
Chemical Modification and Organelle-Specific Localization of Orlistat-Like Natural-Product-Based Probes
作者:Peng-Yu Yang、Kai Liu、Chongjing Zhang、Grace Y. J. Chen、Yuan Shen、Mun Hong Ngai、Martin J. Lear、Shao Q. Yao
DOI:10.1002/asia.201100306
日期:2011.10.4
Orlistat, also known as tetrahydrolipstatin (THL), is an FDA‐approved anti‐obesity drug with potential anti‐cancer activity. Previously, we developed a chemical proteomic approach, based on the Orlistat‐like probe (1a) for large‐scale identification of unknown cellular targets of Orlistat in human hepatocytes. In this article, we report the chemical synthesis and biological evaluation of an expanded
Chiral β<sub>3</sub>-isocyanopropionates for multicomponent synthesis of peptides and depsipeptides containing a β-amino acid fragment
作者:Danil P. Zarezin、Olga I. Shmatova、Valentine G. Nenajdenko
DOI:10.1039/c8ob01507d
日期:——
An efficient three-step synthesis of a novel family of enantiomerically pure isocyanides derived from β3-isocyanopropionic acids was elaborated. Easily available N-formylated α-amino acids were used as starting materials towards this aim. The 3-step sequence (Arndt–Eistert reaction–Wolff rearrangement–dehydration) resulted in target isonitriles in good yields (up to 97%). As a result a new family of
Parasite‐Based Screening and Proteome Profiling Reveal Orlistat, an FDA‐Approved Drug, as a Potential Anti<i>Trypanosoma brucei</i>Agent<sup>[</sup><sup>]</sup>
作者:Peng‐Yu Yang、Min Wang、Kai Liu、Mun Hong Ngai、Omar Sheriff、Martin J. Lear、Siu Kwan Sze、Cynthia Y. He、Shao Q. Yao
DOI:10.1002/chem.201200482
日期:2012.7.2
shows potential activities against tumors, mycobacteria, and parasites. Herein, we report the synthesis and evaluation of an expanded set of orlistat‐like compounds, some of which showed highly potent trypanocidal activities in both the bloodstream form (BSF) and the procyclic form (PCF) of T. brucei. Subsequent in situ parasite‐basedproteomeprofiling was carried out to elucidate potential cellular
Total synthesis of a depsidomycin analogue by convergent solid-phase peptide synthesis and macrolactonization strategy for antitubercular activity
作者:Venugopala K. Narayanaswamy、Fernando Albericio、Yacoob Mohamed Coovadia、Hendrik G. Kruger、Glenn E. M. Maguire、Melendhran Pillay、Thavendran Govender
DOI:10.1002/psc.1389
日期:2011.10
Depsidomycin is a cyclic heptadepsi‐peptide isolated from the cultured broth of Streptomyces lavendofoliae MI951‐62F2. It exhibits significant antimicrobial and immunosuppressive activity. The totalsynthesis of a depsidomycin analogue in which 1,2‐piperazine‐3‐carboxylic acid was substituted with proline is described. After several trials using different strategies, the desired depsidomycin analogue