Enantioselective synthesis of flavonoids. Part 2. Poly-oxygenated α-hydroxydihydrochalcones and circular dichroic assessment of their absolute configuration
Chiral chalcone epoxides exhibiting the oxygenation patterns of naturally occurring flavonoids and isoflavonoids were transformed into the corresponding α-hydroxydihydrochalcones. The availability of both enantiomers permitted assessment of the absolute configuration at the single chiral centre by CD spectroscopy; such protocol being applicable to defining the configuration of some naturally occurring
H2O2 in the presence of poly-α-aminoacid catalysts afforded chiral aromatic oxygenated chalcone epoxides. These were transformed into the corresponding α-hydroxydihydrochalcones and their absoluteconfigurations determined by c.d. spectroscopy. One of these was proved to be identical to a novel αR-analogue from Pericopsis elata.
在聚-α-氨基酸催化剂的存在下,用H 2 O 2将4-甲氧基-2',4'-二甲氧基甲基-()-查尔酮环氧化,得到手性芳族氧化查尔酮环氧化物。将它们转化为相应的α-羟基二氢查耳酮,并通过cd光谱法确定其绝对构型。其中的一个被证明是相同的新颖的α - [R从-analogue大美木豆。
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+
DOI:——
日期:——
MALAN, ELFRANCO;SWINNY, EWALD, PHYTOCHEMISTRY, 29,(1990) N0, C. 3307-3309
作者:MALAN, ELFRANCO、SWINNY, EWALD
DOI:——
日期:——
BEZUIDENHOUDT, BAREND C. B.;SWANEPOEL, ANNELIE;AUGUSTYN, JAN A. N.;FERREI+, TETRAHEDRON LETT., 28,(1987) N 41, 4857-4860
作者:BEZUIDENHOUDT, BAREND C. B.、SWANEPOEL, ANNELIE、AUGUSTYN, JAN A. N.、FERREI+