申请人:Zhang X. Peter
公开号:US20130030170A1
公开(公告)日:2013-01-31
The cobalt(II) complex of new D2-symmetric chiral porphyrin 3,5-DiMes-ChenPhyrin, [Co(P2)], has been shown to be a highly effective chiral metalloradical catalyst for enantioselective cyclopropenation of alkynes with acceptor/acceptor-substituted diazo reagents such as α-cyanodiazoacetamides and α-cyanodiazoacetates. The [Co(P2)]-mediated metalloradical cyclopropenation is suitable to a wide range of terminal aromatic and related conjugated alkynes with varied steric and electronic properties, providing the corresponding tri-substituted cyclopropenes in high yields with excellent enantiocontrol of the all-carbon quaternary stereogenic centers. In addition to mild reaction conditions, the Co(II)-based metalloradical catalysis for cyclopropenation features a high degree of functional group tolerance.
新的D2对称手性卟啉3,5-DiMes-ChenPhyrin的钴(II)络合物[Co(P2)]已被证明是一种高效的手性金属自由基催化剂,用于炔烃与受体/受体取代重氮试剂(如α-氰基重氮乙酰胺和α-氰基重氮乙酸酯)的对映选择性环丙烯化反应。[Co(P2)]介导的金属自由基环丙烯化适用于范围广泛的末端芳香烃和相关共轭炔烃,具有不同的立体和电子性质,可提供相应的三取代环丙烯烃,收率高,对所有碳四取代立体中心的对映选择性控制良好。除了温和的反应条件外,基于Co(II)的金属自由基催化环丙烯化具有高度的官能团容忍性。