Determination of the absolute stereochemistry of the fungal metabolite (<i>R</i>)-(−)-2-(4′-hydroxyphenyl)-2-hydroxyethanoic acid (pisolithin B)
作者:Youla S. Tsantrizos、Kelvin K. Ogilvie
DOI:10.1139/v91-115
日期:1991.5.1
configuration. The stereochemistry was established via comparison of its optical rotation to that of its synthetic (R) and (S) enantiomers. The synthetic samples were prepared by the stereospecific reduction of the prochiral α-keto acid, p-hydroxybenzoylformic acid (2-(4′-hydroxyphenyl)-2-oxoethanoic acid, 2a), with (R) or (S)-2,2′-dihydroxy-1,1′-binaphthyl lithium aluminum hydride (BINAL-H). The absolute
抗真菌抗生素piisolithin B(对羟基扁桃酸,2-(4'-羟基苯基)-2-羟基乙酸,1a)显示具有绝对(R)构型。立体化学是通过比较其旋光度与其合成的 (R) 和 (S) 对映体的旋光度来确定的。合成样品通过前手性α-酮酸、对羟基苯甲酰甲酸(2-(4'-羟基苯基)-2-氧代乙酸,2a)与(R)或(S)-2的立体有择还原制备, 2'-二羟基-1,1'-联萘氢化铝锂 (BINAL-H)。在手性溶剂化剂 (R)-(-)-2,2,2-trifluoro-1-(9-anthryl) 存在下,使用其异丁酯的 1H NMR 确定两种产物的绝对构型和对映体纯度乙醇。关键词:piisolithin B,对羟基扁桃酸,抗真菌,绝对构型。