A method of preparing enatiomerically enriched 3a,6,6,9a-tetramethyl-dodecahydro-naphtho[2,1-b]furan, formula (I), from (E,E)-homofarnesic acid or (E)-monocyclohomofarnesic acid by (a) reacting firstly with a chiral alcohol, (b) reacting the product of (a) with an acid to cause a first cyclisation, (c) producing an alcohol by reacting the product of (b) with a reducing agent and (d) causing a second cyclisation by reacting the product of (c) with an acid. The product of this process gives a mixture of both enantiomers with one in excess.
一种制备对映体富集的3a,6,6,9a-四甲基-十二氢
萘[2,1-b]
呋喃(I)的方法,该方法从(E,E)-同烯酸或(E)-单环同烯酸开始,包括以下步骤:(a)首先与手性醇反应,(b)将(a)的产物与酸反应以引起第一环化,(c)通过将(b)的产物与还原剂反应生成醇,(d)通过将(c)的产物与酸反应引起第二环化。该过程的产物给出了两个对映体的混合物,一个过量。