Metabolites from the purple heartwood of mimosoideae. Part 3. Acacia crombei C. T. White: structure and partial synthesis of crombenin, a natural spiropeltogynoid
作者:Edward V. Brandt、Daneel Ferreira、David G. Roux
DOI:10.1039/p19810001879
日期:——
pirobenzofuran-3(2H)-one, the first spiropeltogynoid, is related to the concomitant crombeone (8-hydroxypeltogynone) from which it is derived via oxidation with alkaline hydrogen peroxide of the chalcone intermediate. The method of synthesis and i.r. spectroscopy define the stereochemistry as either 2(3′)R,4′R or 2(3′)S,4′S. Crombenin is accompanied by the first natural 5,6-dihydroxyphthalide.
Stereoselective synthesis of flavonoids. Part 4. Trans- and cis-dihydroflavonols
作者:Hendrik van Rensburg、Pieter S. van Heerden、Barend C.B. Bezuidenhoudt、Daneel Ferreira
DOI:10.1016/s0040-4020(97)00916-2
日期:1997.10
Epoxidation of a series of poly-oxygenated chalcones with H2O2 in the presence of poly-α-aminoacids yielded chiral aromatic oxygenated oxiranes in moderate to high optical yields. Lewis acid-catalysed phenylmethanethiol ringopening of the epoxide functionality and subsequent formation of the pyranone heterocycle, afforded trans- and cis-dihydroflavonols in moderate to high enantiomeric excess and yield
在聚-α-氨基酸的存在下,用H 2 O 2对一系列多加氧的查耳酮进行环氧化,以中等至高的光学收率得到了手性芳族加氧的环氧乙烷。路易斯酸催化的苯基甲的环氧化物官能团和吡喃酮杂环的随后形成,得到ringopening反式-和CIS在中度至高度对映体过量和产量-dihydroflavonols。
Oyamada, Justus Liebigs Annalen der Chemie, 1939, vol. 538, p. 44,52
作者:Oyamada
DOI:——
日期:——
Drewes; Roux, Biochemical Journal, 1964, vol. 90, p. 343,346
作者:Drewes、Roux
DOI:——
日期:——
Chandorkar; Kulkarni, Current Science, 1957, vol. 26, p. 354