Brønsted Acid Catalyzed Asymmetric Reduction of 2- and 2,9-Substituted 1,10-Phenanthrolines<b />
作者:Costa Metallinos、Fred Barrett、Shufen Xu
DOI:10.1055/s-2008-1032103
日期:——
Several 2- and 2,9-substituted 1,10-phenanthrolines are reduced asymmetrically for the first time using a Hantzsch dihydropyridine in the presence of BINOL-derived phosphoric acid catalysts. The best results are obtained with phenanthrolines bearing unbranched or nitrogen-containing alkyl groups in the 2- or 2,9-positions, which afford chiral octahydrophenanthrolines in a range of yields (40-88%) and
在 BINOL 衍生的磷酸催化剂存在下,使用 Hantzsch 二氢吡啶首次不对称还原了几个 2-和 2,9-取代的 1,10-菲咯啉。最好的结果是在 2- 或 2,9- 位带有无支链或含氮烷基的菲咯啉获得了最好的结果,这提供了一系列产率 (40-88%) 的手性八氢菲咯啉,并且对映体纯度达到了良好到极好的水平。 78-99% ee)。