Bromination and iodination of 6H,12H-5, 11-methanodibenzo[b,f][1,5] diazocine: A convenient entry to unsymmetrical analogs of Tröger's base
6H,12H-5,11-Methanodibenzo[b,f][1,5]diazocine can easily be prepared from aniline and paraformaldehyde. Its reactions with either N-bromosuccinimide (NBS) or with iodine monochloride (ICl) in the presence of a suitable activator smoothly afford 2-bromo- and 2-iodo- derivatives, respectively. The combination of these halogenation methods provides access to the 8-bromo-2-iodo derivative, which is an interesting and otherwise inaccessible intermediate for the synthesis of unsymmetrical analogs of Troger's base. The reported halogenations represent the first examples of electrophilic substitution in 6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)