The intramolecular Schmidt reaction has emerged over recent years as a valuable method for the synthesis of nitrogen-containing molecules. A recent addition to this field has been made within our group consisting of the rearrangement of epoxy azides that has proved extremely useful for the synthesis of pyrrolidines. The scope of this reaction has been further investigated during the studies leading to this thesis. For example, it has been demonstrated for the first time that substrates containing an electron-rich aryl ring can be employed in this aryl amination protocol (Scheme 1). Additionally, it was also discovered that secondary azides can be utilised in such a reaction, which provides a useful strategy for the incorporation of functionality on the pyrrolidine ring. In the light of the success of these reactions, it was also decided to investigate an analogous strategy could also be employed for the synthesis of piperidine derivatives.