Platensimycin is a novel natural product antibiotic that inhibits bacterial growth by inhibiting fatty acid synthesis specifically inhibiting the elongation condensing enzyme FabF. Reaction with diazomethane at controlled temperatures led to selective methylation of the phenolic groups. Methylation, halogenation, reduction, epoxidation, Bayer-Villiger oxidation and details of the conversion of dihydroplatensimycin to the cyclic enamino-amido forms have been described. (c) 2007 Elsevier Ltd. All rights reserved.
Platencin is a novel antibiotic which is active against multiresistant pathogens. We describe efficient syntheses of three platencin analogues of varying activities which allow further conclusions about the pharmacophoric part of the molecule. The unnatural antibiotic iso‐platencin, which is about as active as natural platencin, but much more selective, was identified as a new lead structure.
Chemoenzymatic Syntheses of Some Analogues of the Tricarbocyclic Core of the Anti-Bacterial Agent Platencin and the Biological Evaluation of Certain of their N-Arylpropionamide Derivatives
作者:Rehmani N. Muhammad、Ee Ling Chang、Alistair G. Draffan、Anthony C. Willis、Paul D. Carr、Martin G. Banwell
DOI:10.1071/ch18145
日期:——
those represented by compounds 14, 15, and 27, have been prepared and certain of these elaborated, through substrate-controlled enolate alkylation reactions, to analogues of the natural product. Preliminary biological evaluation of these analogues revealed that they are only weakly active anti-infective agents.
recently discovered antibiotic, has become a highly competitive synthetic target, due to its promising bioactivity and its unusual complex molecular architecture. Herein, a particularly concise total synthesis of platencin starting from inexpensive perillaldehyde is described. The key features of this approach are (1) a highly diastereoselective Diels−Alder reaction with Rawal’s diene—forming the first
A novel route to (±)-platencin is reported, in which the highly stereoselective alkylative quaternization of a cyclohexenone scaffold via 1,4-diastereoinduction and two radical carbon–carbon bond-forming reactions that involve titanium(III)-mediated cyclization and stannyl-radical-mediated skeletal rearrangement are utilized.