This invention relates to a process for preparing (±)-2-exo-(2-Methylbenzyloxy)-1-methyl-4-isopropyl-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]heptane of 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-C4 alkyl alcohol under the reaction conditions, and at least one inert organic solvent, and
(b) simultaneously removing water, the C1-C4 alkyl alcohol or any mixture thereof from the reaction mixture.
本发明涉及一种制备(±)-2-外-(2-甲基苄氧基)-1-甲基-4-异丙基-7-氧杂
双环[2.2.1]庚烷的工艺,其式为(I)
其任何单个对映体或任何非外消旋混合物,包括以下步骤
(a) 使式 (II) 的(±)-2-外-羟基-1-甲基-4-异丙基-7-氧杂
双环[2.2.1]庚烷反应
其任何单个对映体或其任何非外消旋混合物与式 (III) 的 2-甲基苄基化合物的混合物
其中 X 是离去基团,在至少一种在反应条件下能形成
水或 C1-C4 烷醇的碱和至少一种惰性有机溶剂存在下,以及
(b) 同时从反应混合物中除去
水、C1-C4 烷醇或它们的混合物。