In this study, a novel asymmetricsynthesis of all-carbon quaternary stereogeniccentres is developed by the connection of three prochiral or achiral components--conjugated enones, organometallic compounds and vinyl esters--at the...
examined for antimicrobial activity against Gram positive, Gram negative bacteria and fungi. The study of their in vitro antimicrobial activity confirms the significant activity of some monogalactosyl diacylglycerol analogues and establishes for the galactose series that the 1,2-disubstitution and the octanoyl chain are the proper structural features for the maximum activity.
reaction time, enzyme loading and water content on the synthesis of the chloramphenicol esters were studied. The synthesis of chloramphenicol propionate (0.25 M) with 4.0 g L−1 of LipBA loading gave a conversion of ~98% and a purity of ~99% within 8 h at 50 °C in 1,4-dioxane as solvent. The optimum mole ratio of vinyl propionate to chloramphenicol was increased to 5:1. This is the first report of B.
这项工作提出了一种利用脂肪酶的高对映选择性和区域选择性来生产氯霉素酯的合成路线。使用氯霉素、不同碳链长度的酰基供体和脂肪酶LipBA(从解淀粉芽孢杆菌克隆的脂肪酶)合成了一系列氯霉素酯。在具有不同碳链长度的酰基供体中,发现丙酸乙烯酯是最好的。研究了不同有机溶剂、反应温度、反应时间、酶载量和含水量对氯霉素酯合成的影响。使用 4.0 g L-1 LipBA 负载合成氯霉素丙酸酯 (0.25 M),在 1,4-二恶烷作为溶剂中,50 °C 下,8 小时内转化率约为 98%,纯度约为 99%。丙酸乙烯酯与氯霉素的最佳摩尔比提高到5:1。这是首次报道解淀粉芽孢杆菌脂肪酶用于氯霉素酯合成,并详细研究了使用该反应合成丙酸氯霉素。高酶活性和选择性使脂肪酶 LipBA 成为具有复杂结构的分子的绿色化学合成的有吸引力的催化剂。
[EN] NOVEL TRANSITION METAL COMPLEXES, THEIR PREPARATION AND USE<br/>[FR] NOUVEAUX COMPLEXES DE MÉTAUX DE TRANSITION, LEUR PRÉPARATION ET UTILISATION
申请人:LANXESS DEUTSCHLAND GMBH
公开号:WO2014187973A1
公开(公告)日:2014-11-27
Novel transition metal complexes are provided which represent viable catalysts for a broad variety of reactions such as hydrogenation reactions and metathesis reactions. Novel preparation processes are made available via unprecedented routes inter alia not involving structures according to Grubbs I or Grubbs II catalysts.
“CLipP”ing on lipids to generate antibacterial lipopeptides
作者:Victor Yim、Iman Kavianinia、Melanie K. Knottenbelt、Scott A. Ferguson、Gregory M. Cook、Simon Swift、Aparajita Chakraborty、Jane R. Allison、Alan J. Cameron、Paul W. R. Harris、Margaret A. Brimble
DOI:10.1039/d0sc01814g
日期:——
We herein report the synthesis and biological and computational evaluation of 12 linear analogues of the cyclic lipopeptide battacin, enabled by Cysteine Lipidation on a Peptide or Amino Acid (CLipPA) technology.
我们在此报告了通过Cysteine Lipidation on a Peptide or Amino Acid (CLipPA)技术合成的环脂肽battacin的12个线性类似物的生物和计算评价结果。