1,3-Dipolar cycloaddition of several azomethine ylides to [60]fullerene: synthesis of derivatives of 2′,5′-dihydro-1′H-pyrrolo[3′,4′ : 1,2][60]fullerene 1
which reacts with [60]fullerene to afford ethyl 2′,5′-dihydro-1′H-pyrrolo[3′,4′∶1,2][60]fullerene-2′-carboxylate 5. 2-Phenyl-4,5-dihydrooxazol-5-one 6 tautomerizes thermally to form the mesoionic oxazolium5-oxide 6a, which then, as a cyclic azomethine ylide, combines further with [60]fullerene to give 5′-phenyl-2′H-pyrrolo[3′,4′∶1,2][60]fullerene 7 which possesses Cs symmetry.
Diastereoselective lithium salt-assisted 1,3-dipolar cycloaddition of azomethine ylides to the fullerene C60
作者:Vitaliy A. Ioutsi、Alexander A. Zadorin、Pavel A. Khavrel、Nikita M. Belov、Natalia S. Ovchinnikova、Alexey A. Goryunkov、Oleg N. Kharybin、Eugenii N. Nikolaev、Marina A. Yurovskaya、Lev N. Sidorov
DOI:10.1016/j.tet.2010.02.057
日期:2010.4
5-substituted 3,4-fulleroproline esters based on the lithium salt-assisted cycloaddition of azomethine ylides has been developed. A series of the fulleroproline esters containing either electron donating or electron withdrawing substituents was prepared with high yields and diastereoselectivities provided by the S-trans-configuration of ylide generated in situ from the corresponding Schiff base in the presence