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Reference type: Journal
Authors: Nakashima K, Shinkai S, Ikeda A
Article Title: Saccharide libraries as potential templates for regio- and chiroselective introduction of two functional groups into [60]fullerene.
Publication date: 1999
Journal: Journal of Organic Chemistry
Volume: 64
Issue: (3)
Page numbers: 984-990.
DOI: 10.1021/jo9822277

Abstract: This paper reports regio- and chiroselective introduction of two boronic acid groups into [60]fullerene controlled by a saccharide used as a template molecule. The double [4+2] cycloadditions between [60]fullerene and 1:2 saccharide-boronic acid complexes 6-9 afforded [60]fullerene-bisadducts 12. Their structures were identified on the basis of H-1 and C-13 NMR, UV-vis, and CD spectroscopy, mass spectrometry, and chiral HPLC analysis. When 3-O-methyl-D-glucose (4) was used as the template molecule, high regioselectivity was achieved which gave trans-4 isomer 12a as a main isomer in 72.5% yield. The chiro- as well as regioselective preparation of e isomer 12c was attained in 81.4% ee from the 55.7% yield racemic mixture by the reaction using the D-mannitol-3,4-carbonate template (3). When the enantiomers, D-threitol(D-2) and L-threitol(L-2) were used as the templates, cis-3 isomers 12b and ent-12b with opposite chirality were yielded in 44.2 and 45.2% ee, respectively. On the other hand, 1-O- methyl-alpha-D-mannopyranoside template (5) featured nonselective cycloaddition

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