Effects of Neighboring Functional Groups in the Asymmetric Reduction of ω-Substituted Alkyl Phenyl Ketones with Lithium Tri-<i>l</i>-Menthoxyaluminum Hydride
作者:Shozo Yamaguchi、Kuninobu Kabuto
DOI:10.1246/bcsj.50.3033
日期:1977.11
reduction of ω-substituted alkyl phenyl ketones, PhCO(CH2)nY, with lithium tri-l-menthoxyaluminum hydride, the effect of the functional groups, Y(NR2, OMe, and SMe) on the stereoselectivity was examined in comparison with that of the alkyl group. Of the functional groups tested, the MeO group is more effective in enhancing the stereoselectivity than the NMe2 or SMe group except in the case of n=1.
在 ω 取代的烷基苯基酮 PhCO(CH2)nY 与三-l-薄荷氧基氢化铝锂的对映选择性还原中,比较检查了官能团 Y(NR2、OMe 和 SMe)对立体选择性的影响与烷基。在测试的官能团中,除了 n=1 的情况外,MeO 基团在增强立体选择性方面比 NMe2 或 SMe 基团更有效。光学产率还受基材中亚甲基 (n) 的数量影响。这些结果强烈表明 Y 基团与还原剂的配位是立体选择性的重要因素之一。所得醇的绝对构型与其 (+)-MTPA 酯的镧系元素引起的位移 (LIS) 的相对大小相关。