A procedure is described for the preparation of (S)-(-)-pulegone, (-)-1, starting from (S)-(-)-citronellol, (-)-6, in a preparative scale. Compound (-)-1 can easily be converted into (+)-(1S,2R,5S)-5-methyl-2-(1-methyl-1-phenylethyl) cyclohexanol: (+)-2["(+)-8-phenylmenthol"] by a procedure described in literature, which was simplified essentially. Now (+)-2 is accessible in larger amounts and thus is available as an efficient chiral auxiliary in stoichiometric asymmetric syntheses.
描述了一种从(S)-(-)-
香茅醇(-)-6制备(S)-(-)-
胡薄荷酮(-)-1的制备规模方法。化合物(-)-1可以很容易地通过文献中描述的方法转化为(+)-(1S,2R,5S)-5-甲基-2-(1-甲基-1-苯乙基)
环己醇:(+)-2[(+)-苯基薄荷醇],该方法基本上得到了简化。现在可以得到更多的(+)-2,因此它可作为定量不对称合成中的高效手性助剂。