The possibility of using a wide range of synthetic methods and the diverse properties resulted in an increased interest in azahelicenes and similar nitrogen bearing helical molecules. The aim of this paper is to provide an update to the recent reviews, while also including tri and tetracyclic helical molecules.
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A method for the cross-coupling of alkyl electrophiles with various potassium aryl- and heteroaryltrifluoroborates has been developed. Nearly stoichiometric amounts of organoboron species could be employed to cross-couple a large variety of challenging heteroarylnucleophiles. Several functional groups were tolerated on both the electrophilic and the nucleophilic partners. Chemoselective reactivity of C(sp3)-Br bonds in the presence of C(sp2)-Br bonds was achieved.
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