期刊
CHEMICAL SCIENCE
卷 12, 期 18, 页码 6419-6428出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc00279a
关键词
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资金
- European Union [692981, 801378]
- Italian Ministry of University and Research [PRIN 20173L7W8K, FARE R16S9XXKX3]
- Italian Ministry for Education, University and Research (MIUR)
Tris(phenylureido)calix[6]arene possesses unique properties that make it a valuable macrocyclic component for the synthesis of mechanically interlocked molecules. By utilizing its active template synthetic approach, two series of [3]rotaxanes were selectively synthesized with fast kinetics and high yields, demonstrating the kinetic selectivity of the calix[6]arene's nonsymmetric structure.
Tris(phenylureido)calix[6]arene is endowed with unique properties that make it a valuable macrocyclic component for the synthesis of mechanically interlocked molecules. Its three-dimensional and intrinsically nonsymmetric structure is kinetically selective toward two processes: (i) in apolar media, the threading of bipyridinium based axle-like components takes place exclusively from the upper rim; (ii) S(N)2 alkylation reactions of a pyridylpyridinium precursor engulfed in the cavity occur selectively at pyridylpyridinium nitrogen atom located at the macrocycle upper rim (active template synthesis). Here we exploit such properties to prepare two series of [3]rotaxanes, each consisting of three sequence isomers that arise from the threading of two identical but nonsymmetric wheels on a symmetric thread differing only for the reciprocal orientation of the macrocycles. The features of the calix[6]arene and the active template synthetic approach, together with a careful selection of the precursors, enabled us to selectively synthesise the [3]rotaxane sequence isomers of each series with fast kinetics and high yields.
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