Asymmetric Synthesis of Sphinganine and Clavaminol H
作者:Ramzi Ait-Youcef、Xavier Moreau、Christine Greck
DOI:10.1021/jo1003899
日期:2010.8.6
An efficient enantioselective synthesis of sphinganine and clavaminolH is reported. These sphingoid-type bases were obtained from commercially available fatty acids using highly enantioselective Ru-catalyzed hydrogenation and organocatalytic electrophilic amination reactions to create the stereogenic centers.
Here, we report the synthesis of all major 2-alkyl-4(1H)-quinolone N-oxide classes of Pseudomonas and Burkholderia, quantification of their native production levels and their antibiotic activities against competing Staphylococcus aureus.
Synthesis of β-ketoesters from renewable resources and Meldrum's acid
作者:Rafael C. Brinkerhoff、Hernan F. Tarazona、Patrick M. de Oliveira、Darlene C. Flores、Caroline Da R. Montes D'Oca、Dennis Russowsky、Marcelo G. Montes D'Oca
DOI:10.1039/c4ra08986c
日期:——
β-Ketoesters are valuable building blocks for the synthesis of compounds with different biological activities.
β-酮酯是合成具有不同生物活性化合物的宝贵构建模块。
Synthesis, biological evaluation and structure-activity relationships of 5-arylidene tetramic acids with antibacterial activity against methicillin-resistant Staphylococcus aureus
of the ring showed moderate to high activity with minimum inhibitory activity of 4-32 μg/mL against methicillin-resistant Staphylococcus aureus (MRSA), accompanied by no human cell toxicity and hemolytic activity within the tested concentration range. The substituent at para position of the aryl ring seemed to have no or little effect on the antimicrobial activity of these compounds.
Asymmetric synthesis of long chain β-hydroxy fatty acid methyl esters as new elastase inhibitors
作者:Belma Hasdemir、Hülya Çelik Onar、Ayşe Yusufoğlu
DOI:10.1016/j.tetasy.2012.07.004
日期:2012.7
methyl esters with an even carbon chain length of 12–20 1b–5b were synthesized by three different asymmetric reduction methods I, II III from their corresponding β-keto methyl esters 1a–5a with the aim of determining their elastase activities. In method I, chiral catalyst A was prepared fromchiral ligand (R)-binaphthol 1, while in method II, chiral catalyst B was synthesized from (2R,3R)-diisopropyl tartrate