Synthesis of Nitrogen-Doped Aza-Helicenes with Chiral Optical Properties.
J Org Chem
; 87(13): 8406-8412, 2022 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-35730543
ABSTRACT
Aza-helicenes are one of the most important series of heterohelicenes; herein, a series of novel aza-helicenes (5H, 6H, 6S, and 8S) were prepared via Bischler-Napieralski cyclization, and the interconversion dynamic process of these aza-helicenes was revealed using density functional theory calculations. The novel nitrogen-doped [6]helicene (6H) possesses a very high interconversion energy barrier of 36.0 kcal/mol. Two enantiomers of 6H were successfully resolved by high-performance liquid chromatography and showed desired chiral optical properties. 6H with chiral optical activity and lone electrons can be a potential candidate for chiral switches, which was demonstrated using the UV and circular dichroism spectra obtained upon titration with an acid and a base.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2022
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Article