One, two, three, four: twist! Four consecutive (one-pot) electrophilic sulfur insertions on triarylamines with phthalimidesulfenyl chloride (see scheme), offer an easy access to chiral hetero[4]- and -[6]helicenes that are remarkably stable against a reversal of the helicity. These heterohelicenes were resolved by HPLC on an amylose-based chiral stationary phase, and the absolute configuration was established by ab initio calculations and experimental vibrational circular dichroism spectra.
Efficient Thia-Bridged Triarylamine Heterohelicenes: Synthesis, Resolution, and Absolute Configuration Determination / G., L., C., F., Gasparrini, F., Ciogli, A., Villani, C., P. J., S., F. J., D., S., M.. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 14:(2008), pp. 5747-5750. [10.1002/chem.200800705]
Efficient Thia-Bridged Triarylamine Heterohelicenes: Synthesis, Resolution, and Absolute Configuration Determination.
GASPARRINI, Francesco;CIOGLI, Alessia;VILLANI, Claudio;
2008
Abstract
One, two, three, four: twist! Four consecutive (one-pot) electrophilic sulfur insertions on triarylamines with phthalimidesulfenyl chloride (see scheme), offer an easy access to chiral hetero[4]- and -[6]helicenes that are remarkably stable against a reversal of the helicity. These heterohelicenes were resolved by HPLC on an amylose-based chiral stationary phase, and the absolute configuration was established by ab initio calculations and experimental vibrational circular dichroism spectra.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
