Enantioselective synthesis of flavonoids. Part 51. Poly-oxygenated β-hydroxydihydrochalcones
作者:Reinier J.J. Nel、Pieter S. van Heerden、Hendrik van Rensburg、Daneel Ferreira
DOI:10.1016/s0040-4039(98)01064-8
日期:1998.7
Epoxidation of a series of poly-oxygenated chalcones with urea-hydrogen peroxide complex in THF in the presence of DBU and poly-(l)- or -(d)-leucine, followed by TBTH/AIBN catalysed ringopening, afforded β-hydroxydihydrochalcones in moderate to high enantiomeric excess and yield.
The first enantioselective synthesis of trans- and cis-dihydroflavonols
作者:Hendrik van Rensburg、Pieter S. van Heerden、Barend C. B. Bezuidenhoudt、Daneel Ferreira
DOI:10.1039/cc9960002747
日期:——
Epoxidation of a series of polyoxygenated chalcones with H2O2 in the presence of poly(α-amino acid) catalysts, followed by Lewis acid-catalysed phenylmethanethiol ring-opening and cyclization, afforded trans- and cis-dihydroflavonols in moderate to high enantiomeric excess and yield.
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。
AUGUSTYN, JAN A. N.;BEZUIDENHOUDT, BAREND C. B.;FERREIRA, DANEEL, TETRAHEDRON, 46,(1990) N, C. 2651-2660
作者:AUGUSTYN, JAN A. N.、BEZUIDENHOUDT, BAREND C. B.、FERREIRA, DANEEL
DOI:——
日期:——
AUGUSTYN, JAN A. N.;BEZUIDENHOUDT, BAREND C. B.;SWANEPOEL, ANNELIE;FERREI+, TETRAHEDRON, 46,(1990) N2, C. 4429-4442
作者:AUGUSTYN, JAN A. N.、BEZUIDENHOUDT, BAREND C. B.、SWANEPOEL, ANNELIE、FERREI+