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Asymmetric Alkenyl C−H Functionalization by CpxRhIII forms 2H‐Pyrrol‐2‐ones through [4+1]‐Annulation of Acryl Amides and Allenes
Authors:Shou‐Guo Wang  Yang Liu  Nicolai Cramer
Abstract:An efficient CpxRhIII‐catalyzed enantioselective alkenyl C?H functionalization/4+1] annulation of acryl amides and allenes is reported. The described transformation provides straightforward access to enantioenriched α,β‐unsaturated‐γ‐lactams bearing a quaternary stereocenter. The reaction operates under mild conditions, displays a broad functional‐group tolerance, and provides 2H‐pyrrol‐2‐ones with excellent selectivity of up to 97:3 er. Such scaffolds are frequently found in natural products and synthetic bioactive compounds and are of significant synthetic value. It is noteworthy that the allene serves as a one‐carbon unit in the 4+1]‐annulation.
Keywords:[4+1]-Anellierung  Asymmetrische Katalyse  C-H Aktivierung  Chirale Cp-Liganden  Rhodium
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