EP1966233B1 - An Oxidation Process for the Preparation of N-[3-Amino-1- (cyclobutylmethyl)-2,3-Dioxopropyl-3-{n-[(tert-Butylamino)carbonyl]-3-Methyl-L-Valyl}-6,6-Dimethyl-3-Azabicyclo[3.1.0]hexane-2-Carboxamide and Related Compounds