New benzodioxepin type strobilurins from basidiomycetes. Structural revision and determination of the absolute configuration of strobilurin D and related β-methoxyacrylate antibiotics
作者:Veronika Hellwig、Johannes Dasenbrock、Dörte Klostermeyer、Stefan Kroiß、Tilman Sindlinger、Peter Spiteller、Bert Steffan、Wolfgang Steglich、Michaela Engler-Lohr、Sylvia Semar、Timm Anke
DOI:10.1016/s0040-4020(99)00563-3
日期:1999.8
antifungal strobilurins I (1) and K (19) are 3,4-dihydro-2H-benzo[b][1,4]dioxepin derivatives. Their structure and stereochemistry was determined by degradation to aldehyde 3. Both enantiomers of 3 were synthesised and the absolute configurations assigned by the high-field 1H NMR variant of Mosher's method. (S)-3 is identical with the compound derived from the natural products. In the course of these
新的抗真菌球星蛋白I(1)和K(19)是3,4-二氢-2 H-苯并[ b ] [1,4]二恶英衍生物。通过降解为醛3来确定它们的结构和立体化学。合成了两个3的对映异构体,并通过Mosher方法的高场1 H NMR变体确定了绝对构型。(S)-3与源自天然产物的化合物相同。在这些研究的过程中,环氧化物结构15,16和17以前分配给甲氧基丙烯酸酯d,hydroxystrobilurin d和9- methoxystrobilurin K色在被改变18,21和20。所有这些化合物都具有与嗜球果伞素I(1)相同的苯并二恶英核心结构和(S)-构型。