Employing TBN/TEMPO as the catalysts and oxygen as the oxidant, the biologically and pharmaceutically significant tetrahydro-β-carboline and β-carboline alkaloid scaffolds that used to be obtained by multi-step processes can now be selectively obtained in only one-step via direct aerobicoxidative Pictet–Spengler reactions of tryptamines with alcoholsundermildconditions, with water generated as
The unprecedented triarylcarbonium ion-pair-catalyzed Pictet–Spengler reaction of tryptamines with aromaticaldehydes and cyclic ketones in water was disclosed. Under metal-free conditions, diverse tetrahydro-β-carbolines and spirocyclic tetrahydro-β-carbolines were obtained in good yields with excellent functional group tolerance, including late-stage modification of natural products and small molecular
catalytic processes. In this work, a H3PO4·12WO3/OMS-2 nanocomposite catalyst ([PW]-OMS-2) was prepared through the oxidation of a Mn(II) salt with sodium phosphotungstate by KMnO4. Comprehensive characterization indicates that different Mn2+ precursors significantly affected the crystalline phase and morphology of the as-synthesized catalysts and only MnSO4·H2O as the precursor could lead to a cryptomelane
Synthetic analogs of indole-containing natural products as inhibitors of sortase A and isocitrate lyase
作者:Yeon-Ju Lee、Yu-Ri Han、Wanki Park、Seo-Hee Nam、Ki-Bong Oh、Hyi-Seung Lee
DOI:10.1016/j.bmcl.2010.10.029
日期:2010.12
Guided by the inhibitory activities of indole-containing natural products against isocitratelyase (ICL) from Candida albicans and sortase A (SrtA) from Staphylococcus aureus, a series of compounds structurally analogous to natural products were synthesized. Eight SrtA inhibitors and an ICL inhibitor having higher activities than the natural products were discovered by screening the enzyme inhibitory
Design and synthesis of β-carboline and combretastatin derivatives as anti-neutrophilic inflammatory agents
作者:Sunil Kumar、Yi-Hsuan Wang、Po-Jen Chen、Yu-Chia Chang、Hemant K. Kashyap、Ya-Ching Shen、Huang-Ping Yu、Tsong-Long Hwang
DOI:10.1016/j.bioorg.2021.104846
日期:2021.6
A series of β-carbolinederivatives was synthesized by the Pictet-Spengler reaction with or without the combretastatin skeleton. The structures of these derivatives were elucidated by spectroscopic techniques. All synthesized compounds were evaluated for their anti-inflammatory activity in human neutrophils. Among them, two compounds, NTU-228 and HK-72, showed significant inhibitory effects on N-formyl-Met-Leu-Phe