PCy<sub>3</sub>-Catalyzed Ring Expansion of Aziridinofullerenes with CO<sub>2</sub>and Aryl Isocyanates: Evidence for a Two Consecutive Nucleophilic Substitution Pathway on the Fullerene Cage
作者:Youhei Takeda、Hajime Kawai、Satoshi Minakata
DOI:10.1002/chem.201301617
日期:2013.9.27
PCy3‐catalyzed ring‐expansion reaction of aziridine‐fused fullerenes (aziridinofullerenes) through the insertion of CO2 and arylisocyanates is disclosed. The reaction allows for CO2 fixation by aziridinofullerenes, producing oxazolidinone‐fused fullerenes (oxazolidinofullerenes) in high yields, whereas treatment with arylisocyanates led to a new fullerene family—imidazolidinone‐fused fullerenes (imidaz
A new chloramine-based aziridination of C60 and unique rearrangement of aziridinofullerene to azafulleroid is described. The ionic introduction of an N1 unit to C60 via an addition-cyclization mechanism was first achieved under mild conditions; the combination of chloramine and MS4A resulted in the promising rearrangement of aziridinofullerene to azafulleroid, and the isomerization could be performed