Titanium Mediated Cyclization of N-Substituted Di(β-Carbethoxyethyl)amines: Preparation of 1-Substituted-3-carbethoxy-4-piperidones

Abstract
Dieckmann cyclisation of N-substituted di(β-carbethoxy-ethyl)amines with titanium tetrachloride in DCM in the presence of triethylamine leads to the formation of 3-carbethoxy-4-piperidones.