The first example of catalytic enantioselective tautomerization of structurally labile but isolable enamines for accessing their chiral imine-tautomers is described. Kinetically stable enamine-based dibenzo[b,d]azepines were tautomerized by a simple chiral BINOL–phosphoric acid, providing a variety of seven-membered imine products bearing both central and axial stereogenic elements in good yields (up
描述了结构不稳定但可分离的烯胺催化手性
亚胺-互变异构体的催化对映选择性互变异构的第一个实例。动力学稳定的基于烯胺的二苯并[ b,d ]]庚因通过简单的手性BINOL-
磷酸互变异构,提供了多种具有中心和轴向立体异构元素的七元
亚胺产品,收率高(高达96%),且具有优异的收率。对映体和非对映体选择性(高达97%ee,> 20:1 dr)。