Enantioselective synthesis and stereochemical determination of the highly reduced polyketide ishigamide.
Biosci Biotechnol Biochem
; 85(1): 148-153, 2021 Jan 07.
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| MEDLINE
| ID: mdl-33577653
ABSTRACT
Ishigamide was isolated as a metabolite of a recombinant strain of Streptomyces sp. MSC090213JE08 and its unsaturated fatty acid moiety has been confirmed in vitro to be synthesized by a type II PKS. Biosynthesis of such a highly reduced polyketide by a type II PKS is worthy of note. However, absolute configuration of ishigamide remained unknown. (R)-Ishigamide was synthesized enantioselectively employing Stille coupling and Wittig reaction between three units, vinyl iodide, stannyldienal, and Wittig salt. Stereochemistry of natural ishigamide was determined to be R by chiral HPLC analysis comparing with the synthesized standard.
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2021
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Article