1: anhydrous 3-(dimethylamino)propyltriphenylphosphonium bromide hydrobromide With sodium hydride in tetrahydrofuran Wittig Reaction; 3 h; Heating / reflux; 2: (11-oxo-6,11-dihydro-dibenzo[b,e]oxepin-2-yl)-acetic acid benzyl ester in tetrahydrofuran T=0 - 30°C; 3 h; 3: With hydrogenchloride; water in di-isopropyl ether pH=2;