Journal
ACS CATALYSIS
Volume 12, Issue 10, Pages 6209-6215Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c01827
Keywords
asymmetric catalysis; C-H functionalization; chiral Cp ligands; cis-cyclopropanation; rhodium
Categories
Funding
- EPFL
- SNF [157741]
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In this study, a flexible two-step protocol for the efficient and selective synthesis of rigid saturated nitrogen-containing scaffolds was disclosed. The method involves alkenyl C-H functionalization and cyclization reactions mediated by C*Rh-III and Cp*Ir-III catalysts, respectively, leading to the synthesis of diverse substituted 3-azabicyclo[3.1.0]hexanes.
Rigid saturated nitrogen-containing scaffolds such as 3-azabicyclo[3.1.0]hexanes are very important and frequently occurring motifs in biologically active compounds. We disclose a flexible two-step protocol for their efficient and selective access. A tailored C*Rh-III catalyst promotes alkenyl C-H functionalization of N-enoxysuccinimides engaging in rare cis-cyclopropanation of acrolein to access disubstituted cis-cyclopropanes in high enantio- and diastereoselectivity. Subsequently, in the presence of a broad range of primary amines, the dicarbonyl cis-cyclopropanes are efficiently and completely diastereoselectively cyclized by a Cp*Ir-III catalyst via an iterative aminative transfer hydrogen to an exquisite set of substituted 3-azabicyclo[3.1.0]hexanes.
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