A method for predominantly preparing the enantiomer (R)-(+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole, (R)-(+)-1, by separating the racemate (+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole of formula (1), comprising the series of steps of using a lipase or material derived therefrom having enzymatic activity in a transesterification reaction, as well as hydrolysing the resulting ester, (S)-(-)-5-(phenyl)alkylcarbonyloxymethyl-1-methyl-1H-pyrazole, of formula (S)-(-)-4, wherein R.sub.1 is a methyl or ethyl radical.
一种主要制备对映体(R)-(+)-5-(苯基)羟甲基-1-甲基-1H-
吡唑的方法,即(R)-(+)-1,通过分离式样式(1)的外消旋体(+)-5-(苯基)羟甲基-1-甲基-1H-
吡唑,包括以下一系列步骤:使用具有转酯化反应酶活性的
脂肪酶或其衍
生物材料,以及
水解所得的酯(S)-(-)-5-(苯基)烷基羰基氧甲基-1-甲基-1H-
吡唑,式为(S)-(-)-4,其中R.sub.1是甲基或乙基基团。