for the following products
1,1-Dimethylethyl ester2,5-diazabicyclo[2.2.1]heptane-2-carboxylic acid | N-Boc-2,5-Diaza-bicyclo[2.2.1]heptane | tert-Butyl 2,5-diazabicyclo[2.2.1]heptane-2-carboxylate and 2,5-Diaza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester
