This invention relates to a process for preparing (±)-2-exo-(2-Methylbenzyloxy)-1-methyl-4-iso- propyl-7-oxabicyclo[2.2.1]heptane of the formula (I), any of its individual enantiomers or any non-racemic mixture thereof, comprising the steps of (a) reacting (±)-2-exo-hydroxy-1-methyl-4-isopropyl-7-oxabicyclo[2.2.1]heptaneof the formula (II), any of its individual enantiomers or any non-racemic mixture thereof with a 2-Methylbenzyl compound of the formula (III) wherein X is a leaving group in the presence of at least one base capable of forming water or a C1 -C 4 alkyl alcohol under the reaction conditions, and at least one inert organic sol- vent, and (b) simultaneously removing water, the C1-C4 alkyl alcoholor any mixture thereof from the reaction mixture.
这项发明涉及制备(±)-2-外消旋-(2-甲基苄氧基)-1-甲基-4-异丙基-7-氧代-2-环丙基[2.2.1]
庚烷的方法,其
化学式为(I),包括以下步骤:(a)将(±)-2-外消旋-羟基-1-甲基-4-异丙基-7-氧代-2-环丙基[2.2.1]
庚烷的
化学式(II),其任一手性体或非旋光混合物与
化学式(III)中X为脱离基的2-甲基苄化合物在至少一种能够在反应条件下生成
水或C1-C4烷基醇的碱存在下反应,并在至少一种惰性有机溶剂中进行;(b)同时从反应混合物中移除
水、C1-C4烷基醇或二者的混合物。