Enantioselective Access to Spirocyclic Sultams by Chiral Cp<sup>x</sup>
-Rhodium(III)-Catalyzed Annulations
作者:Manh V. Pham、Nicolai Cramer
DOI:10.1002/chem.201504998
日期:2016.2.12
sultams are a valuable compound class in organic and medicinal chemistry. A rapid entry to this structural motif involves a [3+2] annulation of an N‐sulfonyl ketimine and an alkyne. Although the directing‐group properties of the imino group for C−H activation have been exploited, the developments of related asymmetric variants have remained very challenging. The use of rhodium(III) complexes equipped