Optically Active Bicyclic N-Heterocycles by Organocatalytic Asymmetric Michael Addition/Cyclization Sequences
作者:Dennis Worgull、Gustav Dickmeiss、Kim L. Jensen、Patrick T. Franke、Nicole Holub、Karl Anker Jørgensen
DOI:10.1002/chem.201100233
日期:2011.4.4
Highly stereoselective one‐pot syntheses of various opticallyactive N‐heterocyclic bicycles have been developed. The protocols are based on an organocatalytic, asymmetric Michael addition followed by a condensation/cycloaddition sequence to furnish aziridine carbonyls, β‐lactams, or octahydrobenzo[c]isoxazoles depending on the reaction conditions and applied nucleophiles.
已开发出各种光学活性N杂环自行车的高度立体选择性单锅合成器。该方案基于有机催化,不对称迈克尔加成,然后进行缩合/环加成序列,以根据反应条件和所应用的亲核试剂提供氮丙啶羰基,β-内酰胺或八氢苯并[ c ]异恶唑。
Asymmetric One-Pot Sequential Organo- and Gold Catalysis for the Enantioselective Synthesis of Dihydropyrrole Derivatives
作者:David Monge、Kim L. Jensen、Patrick T. Franke、Lennart Lykke、Karl Anker Jørgensen
DOI:10.1002/chem.201001123
日期:2010.8.16
A direct asymmetric one‐pot synthesis of optically active 2,3‐dihydropyrroles from propargylated malononitrile and N‐Boc‐protected (Boc=tert‐butoxycarbonyl) imines is presented. The approach is based on a bifunctional organocatalytic Mannich‐type reaction and a subsequent gold‐catalyzed alkyne hydroamination and isomerization. The compatibility of both catalytic systems is presented and the overall