Synthesis and absolute configuration of (1S,8S)-as-hydrindacene-1,8-diol as determined by the circular dichroism exciton chirality method
作者:Koen Vandyck、Bavo Matthys、Johan Van der Eycken
DOI:10.1016/j.tetlet.2004.11.028
日期:2005.1
enantioselectivity (98.5% ee), depending on the conditions. The asymmetric reduction was expected to yield the (S)-alcohols using the (S,S)-Ts-DPEN ligand, which was confirmed by the appliance of the exciton chirality method on the corresponding bis(p-dimethylamino)benzoate 7.
-2,3,6,7-四氢作为-indacene -1,8-二酮4在由文献方法的变形例,由2-甲基呋喃起始4个步骤制备。使用Noyori的不对称转移氢化可以高收率(81%)生成(1 S,8 S)-1,2,3,6,7,8-六氢为-indacene-1,8-diol 5对映选择性(> 99%ee)的或(8小号)-8-羟基3,6,7,8四氢-2- ħ -如-indacen -1-酮6在中等产率(58%)和同样高对映选择性( 98.5%ee),取决于条件。不对称还原预期,得到(小号使用) -醇(S,S)-Ts-DPEN配体,这是通过对相应的双(对-二甲基氨基)苯甲酸酯7的激子手性方法的应用证实的。