Convergent approach to the maduropeptin chromophore: aryl ether formation of (R)-3-aryl-3-hydroxypropanamide and cyclization of macrolactam
摘要:
Efficient enantioselective syntheses of the functionalized phenol and diethynylcyclopentene moiety of the maduropeptin chromophore were achieved. Their CsF-mediated coupling yielded a sterically congested aryl propargyl ether. The subsequent intramolecular Sonogashira coupling reaction between the vinyl iodide and diethynyl groups occurred at the appropriate position to yield a macrolactam, which was accompanied by Pd-mediated enyne-yne benzarmulation. (C) 2004 Elsevier Ltd. All rights reserved.
Understanding Programming of Fungal Iterative Polyketide Synthases: The Biochemical Basis for Regioselectivity by the Methyltransferase Domain in the Lovastatin Megasynthase
作者:Ralph A. Cacho、Justin Thuss、Wei Xu、Randy Sanichar、Zhizeng Gao、Allison Nguyen、John C. Vederas、Yi Tang
DOI:10.1021/jacs.5b11814
日期:2015.12.23
Highly reducingpolyketidesynthases (HR-PKSs) from fungi synthesize complex natural products using a single set of domains in a highly programmed, iterative fashion. The most enigmatic feature of HR-PKSs is how tailoring domains function selectively during different iterations of chainelongation to afford structural diversity. Using the lovastatin nonaketide synthase LovB as a model system and a
作者:Teruaki Mukaiyama、Nobuharu Iwasawa、Rodney W. Stevens、Toru Haga
DOI:10.1016/s0040-4020(01)82423-6
日期:1984.1
A highly diastereoselective cross aldolreaction is developed using divalent tin enolates formed from stannous trifluoromethanesulfonate and carbonyl compounds. The reaction is extended to a highly enantioselective cross aldolreaction employing chiral diamines derivedfrom (S)-proline as ligands.
EFFICIENT ASYMMETRIC INDUCTION VIA COORDINATION OF CHIRAL DIAMINE TO TIN(II) ENOLATE: A HIGHLY ENANTIOSELECTIVE SYNTHESIS OF 2-SUBSTITUTED MALATES
作者:Rodney W. Stevens、Teruaki Mukaiyama
DOI:10.1246/cl.1983.1799
日期:1983.11.5
In the presence of chiral diamine, (2S)-1-methyl-2-[(N-1-naphthylamino)methyl]pyrrolidine, the tin(II) enolate of 3-acetylthiazolidine-2-thione reacts with various α-ketoesters to afford the corres...
Synthesis of Analogues of (<i>E</i>)-1-Hydroxy-2-methylbut-2-enyl 4-Diphosphate, an Isoprenoid Precursor and Human γδ T Cell Activator
作者:Steven Van Hoof、Carl Jeffrey Lacey、René C. Röhrich、Jochen Wiesner、Hassan Jomaa、Serge Van Calenbergh
DOI:10.1021/jo701873t
日期:2008.2.1
intermediate in the non-mevalonatepathway for the biosynthesis of isoprenoids and also serves as a very strong activator of human γδ T cells expressing Vγ9Vδ2 receptors. This paper describes the synthesis of analogues of HMBPP, in which the diphosphate group is replaced by potential isosteric moieties, i.e., carbamate, N-acyl-N‘-oxy sulfamate, or aminosulfonyl carbamate functionalities. The potential of the synthesized
Both α- and β-C-glycosides can be prepared by SnCl4-mediated addition of titanium enolates from N-acetylthiazolidinethiones to glycals. Subsequent removal of the chiral auxiliary provides enantiomerically pure fragments that are useful for the synthesis of natural products.