Synthesis for the mesomer and racemate of thiophene-based double helicene under irradiation

J Org Chem. 2013 Jun 21;78(12):6316-21. doi: 10.1021/jo400691s. Epub 2013 Jun 10.

Abstract

In this work, the racemate and mesomer of the thiophene-based naphthalene-cored double helicenes (1) were obtained efficiently by one-pot photocyclization of 1,1,2,2-tetrakis(dithieno[2,3-b:3',2'-d]thiophen-2-yl)ethene in the presence of iodine in dry benzene. The structure of meso-1a was confirmed by single crystal X-ray analysis. The chiral resolution of the racemate was carried out by chiral HPLC, and the chiral properties, such as CD spectra, optical rotations, and half-life of enantiomers were characterized.