1: 3,6-dioxa-4-lt;(allyloxy)methylgt;-1,8-octanediol With sodium hydride in DMF (N,N-dimethyl-formamide) 1.5 h; 2: 2-(2-bromoethoxy)-2H-tetrahydropyran in DMF (N,N-dimethyl-formamide) 48 h; Heating / reflux; 3: With hydrogenchloride in methanol; dichloromethane 48 h;