1: With hydrogen bromide in water 6 h; Heating / reflux; 2: With sodium hydroxide in water pH=9;

1: 4-(N,N-dimethlyamino)pyridine; triethylamine; benzenesulfonyl chloride / dichloromethane 2: acetic anhydride / AlCl3 / dichloromethane 3: sodium hydroxide; sodium borohydride / water; trifluoroacetic acid 4: hydrogen bromide View Scheme

1: acetic anhydride / AlCl3 / dichloromethane 2: sodium hydroxide; sodium borohydride / water; trifluoroacetic acid 3: hydrogen bromide View Scheme

1: sodium hydroxide; sodium borohydride / water; trifluoroacetic acid 2: hydrogen bromide View Scheme

hydrogenchloride anschliessend mit amalgamiertem Zink und wss. Salzsaeure behandeln;

1: aluminium chloride; carbon disulfide 2: aqueous hydrochloric acid / anschliessend mit amalgamiertem Zink und wss. Salzsaeure behandeln View Scheme