Synthesis of penicillenol C1 and of a bis-azide analogue for photoaffinity labeling.
2013
Two diasteroisomers of the Penicillium metabolite penicillenol C1 were synthesized for the first time by 3-acylation of an
l-threonine-derived
tetramicacid with enantiopure 2-methyloct-(6E)-enoic acids. The 5S,6R,9S isomer has NMR spectra and
optical rotationidentical with those of the natural compound. A bis-
azide-tagged penicillenol analogue was also synthesized for
photoaffinity labelingof
target proteins. The photolysis of the bis-
azidein the presence of methanol as a protein-mimicking nucleophile led to reaction only of the aryl
azide, while leaving the benzyl
azideavailable for pull-downs or the attachment of fluorescent tracers. As a proof of concept, the distribution of this bis-
azide-tagged
tetramicacid in living cells was visualized via a Staudinger ligation between the
azidetag and a phosphane fluorophore.
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