Highly Enantioselective SPINOL-Derived Phosphoric Acid Catalyzed Transfer Hydrogenation of Diverse C=N-Containing Heterocycles
作者:Yiliang Zhang、Rong Zhao、Robert Li-Yuan Bao、Lei Shi
DOI:10.1002/ejoc.201500330
日期:2015.5
A highly efficient and enantioselective hydrogenation of diversely substituted C=N-containing heterocyclic compounds such as 3-aryl-1,4-benzoxazines and 2-arylquinolines was experimentally explored by using 1,1′-spirobiindane-7,7′-diol-derived chiral phosphoric acids as the catalyst. This method provides straightforward access to the corresponding tetrahydroquinolines and dihydro-2H-1,4-benzothiazines
通过使用 1,1'-spirobiindane-7,7'-diol- 实验探索了多种取代的 C=N 杂环化合物(如 3-芳基-1,4-苯并恶嗪和 2-芳基喹啉)的高效和对映选择性氢化反应。衍生手性磷酸作为催化剂。该方法可以直接获得相应的四氢喹啉和二氢-2H-1,4-苯并噻嗪,收率高(85-99%),具有出色的对映选择性(91-99%)。该方法的吸引人的特点包括反应条件温和、操作简单、催化剂负载量相对较低 (1 mol-%) 和高水平的对映选择性,使其成为实际合成光学活性含氮芳香杂环的有用方法.