2-Bromo[6]helicene as a Key Intermediate for [6]Helicene Functionalization

J Org Chem. 2018 Apr 6;83(7):3607-3616. doi: 10.1021/acs.joc.7b03234. Epub 2018 Mar 19.

Abstract

The synthesis of 2-bromo[6]helicene was revised and improved up to 51% yield. Its reactivity was thoroughly investigated, and a library of 17 different carbon, boron, nitrogen, phosphorus, oxygen and sulfur substituted derivatives was prepared. The racemization barrier for 2-bromo[6]helicene was determined, and the usage of enantiomers in the synthesis of optically pure helicenes was rationalized. The three most energy-demanding reactions using enantiomerically pure 2-bromo[6]helicene were tested in order to confirm the predicted enantiomeric excess.

Publication types

  • Research Support, Non-U.S. Gov't