Asymmetric Synthesis of Tropanes by Rhodium-Catalyzed [4 + 3] Cycloaddition
作者:Ravisekhara P. Reddy、Huw M. L. Davies
DOI:10.1021/ja072936e
日期:2007.8.1
Rhodium-catalyzed [4 + 3] cycloadditionbetween methyl 2-(siloxy)vinyldiazoacetate and pyrroles results in the enantioselective synthesis of highly functionalized 8-azabicyclo[3.2.1]octa-2,6-dienes (tropanes). The reaction proceeds via a rhodium−carbenoid intermediate and involves a tandem cyclopropanation/Cope rearrangement mechanism. The optimum chiral dirhodium catalyst for this transformation is