A Facile Synthesis of Dragmacidin B and 2,5-Bis(6‘-bromo-3‘-indolyl)piperazine
作者:Fumiko Y. Miyake、Kenichi Yakushijin、David A. Horne
DOI:10.1021/ol0001970
日期:2000.10.1
A short synthesis of dragmacidin B (1), 2,5-bis(6'-bromo-3'-indolyl)piperazine (2), and corresponding didebromo analogues 8 and 9 is described. The key steps involve the dimerization of oxotryptamines 4 and 11 to give bis(indolyl)pyrazines 5 and 12, which upon selective reduction and reductive methylation with sodium cyanoborohydride afforded the requisite piperazine natural products.
Reduction of 2,5-Bis(3′-indolyl)pyrazines to 2,5-Bis(3′-indolyl)piperazines: Synthesis of Bisindolylpiperazine Marine Alkaloids Dragmacidin A, B, and C
作者:David A. Horne、Fay Tonsiengsom、Fumiko Y. Miyake、Kenichi Yakushijin
DOI:10.1055/s-2005-918431
日期:——
A concise totalsynthesis of the bisindole alkaloids dragmacidin A, B and C is described that centers on the preparation and reduction of 2,5-bis(3'-indolyl)pyrazines to 2,5-bis(3'-indolyl)piperazines.
Phosphine Supported Ruthenium Nanoparticle Catalyzed Synthesis of Substituted Pyrazines and Imidazoles from α-Diketones
作者:Prasad Ganji、Piet W. N. M. van Leeuwen
DOI:10.1021/acs.joc.6b03032
日期:2017.2.3
pyrazines and imidazoles starting fromα-diketones using phosphine supported ruthenium nanoparticles (RuNPs) as catalysts. Ruthenium nanoparticles Ru1–Ru4 supported with different phosphines such as dbdocphos, dppp, DPEphos, and Xantphos are screened, of which Ru1 and Ru4 are found to be the most active. Interestingly, aryl-substituted and alkyl-substituted α-diketones produced different products: namely
Nature-Inspired (di)Azine-Bridged Bisindole Alkaloids with Potent Antibacterial <i>In Vitro</i> and <i>In Vivo</i> Efficacy against Methicillin-Resistant <i>Staphylococcus aureus</i>
作者:Nidja Rehberg、Gereon A. Sommer、Daniel Drießen、Marco Kruppa、Emmanuel T. Adeniyi、Shang Chen、Lin Wang、Karina Wolf、Boris O. A. Tasch、Thomas R. Ioerger、Kui Zhu、Thomas J. J. Müller、Rainer Kalscheuer
DOI:10.1021/acs.jmedchem.0c00826
日期:2020.11.12
highly active againstmethicillin-resistantStaphylococcusaureus (MRSA) and further Gram-positive pathogens at minimal inhibitory concentrations ranging from 0.20 to 0.78 μM. These compounds showed strong bactericidal killing effects but only moderate cytotoxicity against human cell lines. Furthermore, the two front-runner compounds 4j and 4n exhibited potent in vivo efficacy againstMRSA in a mouse
The formal total synthesis of dragmacidin B, trans-dragmacidin C, and cis- and trans-dihydrohamacanthins A
作者:Neil K. Garg、Brian M. Stoltz
DOI:10.1016/j.tetlet.2005.02.054
日期:2005.4
A facile formal totalsynthesis of dragmacidinB, trans-dragmacidin C, and cis- and trans-dihydrohamacanthins A is presented. Our approach to these bis(indole) alkaloids involves a one-pot, four-step cross-coupling/deprotection sequence where complete halogen selectivity is observed. A related approach to access the dihydrohamacanthins is also described.