García-González MC, Aguilar-Granda A, Zamudio-Medina A, Miranda LD, Rodríguez-Molina B. Synthesis of Structurally Diverse Emissive Molecular Rotors with Four-Component Ugi Stators.
J Org Chem 2018;
83:2570-2581. [PMID:
29457731 DOI:
10.1021/acs.joc.7b02858]
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Abstract
The use of the multicomponent Ugi reaction to rapidly prepare a library of dumbbell-like molecular rotors is highlighted here. The synthetic strategy consisted of the atom-economic access to 15 bulky and structurally diverse iodinated stators, which were cross-coupled to the 1,4-diethynylphenylene rotator. From those experiments, up to six rotors 1a-c and 1l-n were obtained, with yields ranging from 35 to 69% per coupled C-C bond. In addition to the framework diversity, five of these compounds showed aggregate-enhanced emission properties thanks to their conjugated 1,4-bis(phenylethynyl)benzene cores, a property that rises by increasing the water fraction (fw) in their THF solutions. The results highlight the significance of the diversity-oriented synthesis of rapid access to new molecular fluorescent rotors.
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