Synthesis and stereochemical properties of chiral hetero[7]helicenes structured by a benzodiheterole ring core

Sachie Arae, Takaaki Mori, Takahiro Kawatsu, Daiki Ueda, Yusuke Shigeta, Nobutsugu Hamamoto, Hitoshi Fujimoto, Michinori Sumimoto, Tatsushi Imahori, Kazunobu Igawa, Katsuhiko Tomooka, Tharmalingam Punniyamurthy, Ryo Irie

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Abstract

A new hetero[7]helicene 1NN structured by a diazabenzodiheterole (pyrroloindole) ring core was successfully synthesized by catalytic domino cyclodehydrogenation with Pd(OAc)2 and O2 as the key step. Significantly, 1NN was stereochemically stable at room temperature and could be subjected to optical resolution by chiral HPLC. Furthermore, kinetic analysis of 1NN and DFT calculations on its variants revealed that the stereo-chemical stability of the benzodiheterole-based helicenes was highly dependent on not only the heteroaromatic ring component but also on the N-substituent of the pyrrole ring unit.

Original languageEnglish
Pages (from-to)1214-1216
Number of pages3
JournalChemistry Letters
Volume46
Issue number8
DOIs
Publication statusPublished - Jan 1 2017

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Arae, S., Mori, T., Kawatsu, T., Ueda, D., Shigeta, Y., Hamamoto, N., ... Irie, R. (2017). Synthesis and stereochemical properties of chiral hetero[7]helicenes structured by a benzodiheterole ring core. Chemistry Letters, 46(8), 1214-1216. https://doi.org/10.1246/cl.170410