The stereoselective synthesis of several components of the aggregation pheromones of numerous longhorn beetle species is described. These attractants consist of 3-hydroxy-2-alkanones and 2,3-alkyldiols­ with chain lengths varying from six to ten carbons. The 3R- and 3S-series are generated by organocatalytic α-hydroxylation of alkyl ketones with nitrosobenzene in the presence of l- or d-proline, respectively, to obtain the hydroxyketones in high enantiomeric excess. Further reduction and chromatographic separation lead to the enantiomerically pure diols that complete the library.

中文翻译：

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脯氨酸介导的烷基酮α-羟基化合成长角甲虫信息素成分

描述了许多长角甲虫物种聚集信息素的几种成分的立体选择性合成。这些引诱剂由 3-羟基-2-烷酮和 2,3-烷基二醇组成，链长从 6 到 10 个碳不等。3R-和 3S-系列分别通过烷基酮与亚硝基苯在 l-或 d-脯氨酸存在下的有机催化 α-羟基化产生，以获得高对映体过量的羟基酮。进一步的还原和色谱分离得到完整的对映异构纯二醇。