Synthesis of Structurally Diverse Emissive Molecular Rotors with Four-Component Ugi Stators

J Org Chem. 2018 Mar 2;83(5):2570-2581. doi: 10.1021/acs.joc.7b02858. Epub 2018 Feb 22.

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.

Publication types

  • Research Support, Non-U.S. Gov't