synthesis. Here, by combining the squaramide and DBU catalysis, a sequential asymmetric conjugate addition/cyclization reaction between benzofuran-derived azadienes and ynones has been well-developed, providing straightforward access to chiral eight-membered N-heterocycles in high yields with stereoselectivities. This protocol features the use of a bifunctional squaramide catalyst for controlling the enantioselectivity
八元N-杂环的对映选择性合成是有机合成中长期存在的挑战。在这里,通过结合方酰胺和
DBU 催化,
苯并呋喃衍生的氮杂二烯和炔酮之间的连续不对称共轭加成/环化反应已经得到很好的发展,提供了以高产率和立体选择性直接获得手性八元 N 杂环的方法。该方案采用双功能方酰胺催化剂控制产物的对映选择性,同时利用
DBU实现分子内环化,提高产物的非对映选择性。