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          Institute: MPI für Kohlenforschung     Collection: Publikationen MPI für Kohlenforschung     Display Documents

ID: 20110.0, MPI für Kohlenforschung / Publikationen MPI für Kohlenforschung
Total synthesis of the turrianes and evaluation of their DNA- cleaving properties
Authors:Fürstner, A.; Stelzer, F.; Rumbo, A.; Krause, H.
Date of Publication (YYYY-MM-DD):2002-04-15
Title of Journal:Chemistry-A European Journal
Journal Abbrev.:Chem.-Eur. J.
Issue / Number:8
Start Page:1856
End Page:1871
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The first total synthesis of three naturally occurring cyclophane derivatives belonging to the turriane family of natural products is described, Their sterically hindered biaryl entity is formed by reaction of the Grignard reagent derived from aryl bromide 10 with the oxazoline derivative 18, and the macrocyclic tether of the targets is efficiently forged by ring closing metathesis. While conventional RCM catalyzed by the ruthenium-carbene complexes 33 or 34 invariably leads to the formation of mixtures of both stereoisomers with the undesirable (E)-alkene prevailing, ring closing alkyne metathesis (RCAM) followed by Lindlar reduction of the resulting cycloalkynes 37 and 38 opens a convenient and stereoselective entry into this class of compounds. RCAM can either be accomplished by using the tungsten alkylidyne complex [(tBuO)(3)Wequivalent toCCMe(3)] or by means of a catalyst formed in situ from [Mo(CO)(6)] and para-trifluoromethylphenol. The latter method is significantly accelerated when carried out under microwave heating. Furthermore, the judicious choice of the protecting groups for the phenolic -OH functions turned out to be crucial. PMB-ethers were found to be compatible with the diverse reaction conditions en route to 3-5 their cleavage, however, had to be carried out under carefully optimized conditions to minimize competing O-C PMB migration. Turrianes 3-5 are shown to be potent DNA cleaving agents under oxidative conditions when administered in the presence of copper ions.
Free Keywords:alkynes; DNA; metathesis; molybdenum; natural products
Comment of the Author/Creator:Date: 2002, APR 15
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N. N.
Affiliations:MPI für Kohlenforschung
Identifiers:ISI:000175084000011 [ID No:1]
ISSN:0947-6539 [ID No:2]
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