A straightforward route to helically chiral N-heteroaromatic compounds: practical synthesis of racemic 1,14-diaza[5]helicene and optically pure 1- and 2-aza[6]helicenes - Mísek, Jirí; Teplý, Filip; Stará, Irena G; Tichý, Milos; Saman, David; Císarová, Ivana; Vojtísek, Pavel; Starý, Ivo (Angewandte Chemie (International ed. in English), 2008)