Four stereoisomers of methyl 3-hydroxy-2-methylbutyrate (I), (+)-threo-I, (−)-threo-I, (+)-erythro-I, and (−)-rythro-I, were prepared, and their absolute configurations were determined. The configurations of (+)-threo-I, [α]D20+36.80° (c 5, methanol) and (+)-erythro-I, [α]D20+14.32° (c, 5, methanol) were assigned to (2S, 3S) and (2S, 3R) respectively.
制备了
3-羟基-2-甲基丁酸甲酯 (I) 的四种立体异构体:(+)-threo-I、(-)-threo-I、(+)-erythro-I 和 (-)-rythro-I,并测定了它们的绝对构型。(+)-threo-I, [α]D20+36.80° (c 5, methanol) 和 (+)-erythro-I, [α]D20+14.32° (c, 5, methanol) 的构型分别为 (2S, 3S) 和 (2S, 3R)。