乙醛酸乙酯 、
2-甲基戊醛 在
L-组氨酸 作用下,
以
乙二醇 为溶剂,
生成 2(S)-hydroxy-3(R)-methyl-3-propyl-4-oxobutyric acid ethyl ester 、
2(R)-hydroxy-3(R)-methyl-3-propyl-4-oxobutyric acid ethyl ester 、 2(S)-hydroxy-3(S)-methyl-3-propyl-4-oxobutyric acid ethyl ester 、 2(R)-hydroxy-3(S)-methyl-3-propyl-4-oxobutyric acid ethyl ester