Cooperative Catalysis for the First Asymmetric Formal [3+2] Cycloaddition Reaction of Isocyanoacetates to α,β-Unsaturated Ketones
作者:Carlos Arróniz、Alberto Gil-González、Vladislav Semak、Carmen Escolano、Joan Bosch、Mercedes Amat
DOI:10.1002/ejoc.201100409
日期:2011.7
cooperative multicatalytic cascade sequence involving isocyanoacetates and α,β-unsaturated ketones is described for the enantioselective synthesis of 2,3-dihydropyrroles. The key to promoting the multistep asymmetric reaction is the combination of cinchona alkaloid derived organocatalysts with silver nitrate. Merging both organic and metal catalytic cycles enables the formation of two C–C bonds and
描述了一种涉及异氰基乙酸酯和 α,β-不饱和酮的协同多催化级联序列,用于对映选择性合成 2,3-二氢吡咯。促进多步不对称反应的关键是金鸡纳生物碱衍生的有机催化剂与硝酸银的结合。合并有机和金属催化循环可以在单个过程中形成两个 C-C 键并生成立体中心。该研究还表明,有机催化剂的双功能作用对于环加成反应的不对称形式至关重要。