1: 3-oxa-7,9-diazabicyclo[3.3.1]nonane-7,9-dicarboxylic acid di-tert-butyl ester With hydrogenchloride; ethanol; water 0.5 h; 2: 1-(chloromethyl)-4-fluorobenzene With sodium hydrogencarbonate in ethanol 1.5 h; Heating / reflux;