activated N,4-dialkylpyridinium salts and acyclic α,β-unsaturated ketones was developed by the cascade iminium ion–enamine catalysis of a cinchona-derived amine. A spectrum of valuable azaspiro[5.5]undecane architectures was efficiently constructed with high to excellent diastereoselectivity and enantioselectivity.
活化的N,4-二烷基
吡啶鎓盐与无环的α,β-不饱和酮的不对称脱芳族形式[4 + 2]环加成反应是由
金鸡纳胺的级联
亚胺亚胺离子-烯胺催化而开发的。高效地构建了一系列有价值的氮杂螺[5.5]
十一烷结构,具有很高的非对映选择性和对映选择性。