Efficient synthesis and biological evaluation of proximicins A, B and C
摘要:
A quick and efficient synthesis and the biological evaluation of promising antitumor-antibiotics proximicins A, B and C are reported. The characteristic repetitive unit of these molecules, the methyl 4-Boc-aminofuran-2-carboxylate 15, was prepared in three synthetic steps in good yield using an optimised copper-catalysed amidation method. The proximicins were evaluated for their antitumor activity using cellular methods. Proximicin B induced apoptosis in both Hodgkin's lymphoma and T-cell leukemia cell lines and proximicin C exhibited significantly high cytotoxicity against glioblastoma and breast carcinoma cells. The proximicins were also screened against Escherichia coli, Enterococcus faecalis and several strains of methicillin-and multidrug-resistant Staphylococcus aureus. Proximicin B showed noteworthy activity against antibiotic-resistant Gram-positive cocci. (C) 2012 Elsevier Ltd. All rights reserved.
Efficient synthesis and biological evaluation of proximicins A, B and C
摘要:
A quick and efficient synthesis and the biological evaluation of promising antitumor-antibiotics proximicins A, B and C are reported. The characteristic repetitive unit of these molecules, the methyl 4-Boc-aminofuran-2-carboxylate 15, was prepared in three synthetic steps in good yield using an optimised copper-catalysed amidation method. The proximicins were evaluated for their antitumor activity using cellular methods. Proximicin B induced apoptosis in both Hodgkin's lymphoma and T-cell leukemia cell lines and proximicin C exhibited significantly high cytotoxicity against glioblastoma and breast carcinoma cells. The proximicins were also screened against Escherichia coli, Enterococcus faecalis and several strains of methicillin-and multidrug-resistant Staphylococcus aureus. Proximicin B showed noteworthy activity against antibiotic-resistant Gram-positive cocci. (C) 2012 Elsevier Ltd. All rights reserved.
The invention relates to compounds of formula (I), and their use as herbicides. In said formula, R1 to R9 represent groups such as hydrogen, halogen or organic groups such as alkyl, alkenyl, alkynyl, or alkoxy; X is a bond or a divalent unit; Y is hydrogen, cyano, hydroxyl or a linear or cyclic organic group. The invention further refers to a composition comprising such compound and to the use thereof for controlling unwanted vegetation.
Total Synthesis of Proximicin A−C and Synthesis of New Furan-Based DNA Binding Agents
作者:Falko E. Wolter、Kathrin Schneider、Brian P. Davies、Elke R. Socher、Graeme Nicholson、Oliver Seitz、Roderich D. Süssmuth
DOI:10.1021/ol901003p
日期:2009.7.2
The total synthesis of the natural occurring polyamides proximicin A−C (3−5) has been accomplished. A short and efficient synthesis of a thus far unknown 4-amino-2-furan carboxylic acid was developed. Furthermore, this unique heterocyclic γ-amino-acid was used for the synthesis of a new class of AT-selective DNA-binding agents derived from the natural products combining structural features of the proximicins
Synthesis of (±)-8-Oxa-3-azabicyclo[3.2.1]octan-2-thione and (±)-2-Oxa-5-azabicyclo[2.2.1]heptan-6-thione: Potential Synthons for the Preparation of Novel Heteroaryl-Annulated Bicyclic Morpholines
The bridgedbicyclic morpholinethiones (±)-8-oxa-3-azabicyclo[3.2.1]octane-2-thione and (±)-2-oxa-5-azabicyclo[2.2.1]heptane-6-thione have been prepared in five and eight steps, respectively. Both compounds were derived from a respective requisite cis-disubstituted tetrahydrofuran, which was stereoselectively prepared via hydrogenation of the corresponding disubstituted furan derivatives. stereoselective