期刊
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
卷 77, 期 9, 页码 1703-1716出版社
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.77.1703
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We describe the total syntheses of natural pseurotins A and F-2, inhibitors of chitin synthase, both of which possess an unusual 1-oxa-7-azaspiro [4.4] non-2-ene-4,6-dione ring system. The total syntheses of these spiro-hetereocyclic natural products feature: 1) a stereoselective preparation of two segments, i.e., a 2,3-dihydroxylated heptenal derivative and a highly functionalized gamma-lactone, each from D-glucose, 2) the connection of the two segments via an aldol-type carbon-carbon bond formation, 3) spirocyclic ring formation from the aldol adduct through convenient 3(2H)-furanone formation, 4) the transformation of a spirocyclic gamma-lactone into a gamma-lactam hemiaminal derivative, and 5) conversion of the benzyl substituent in the gamma-lactam ring into a benzoyl group via a cyclic enamide followed by m-CPBA oxidation in the final stage of the total synthesis. In the initial stage, the quaternary spiro-carbon center in the target molecules was efficiently constructed by a stereochemically exclusive vinyl Grignard addition to the D-glucose-derived 3-ulose. Furthermore, the preparation of the gamma-lactone included a stereo- and regioselective Cu(l)-mediated benzyl Grignard addition to aldehyde. We have also completed the total synthesis of a structurally related novel angiogenesis inhibitor, azaspirene, using the analogous reaction sequence.
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