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。