1: 2,3-dihydroxy-benzaldehyde With acetic anhydride; acetic acid 12 h; Heating; 2: isopropyl bromide With potassium carbonate in N,N-dimethyl-formamide T=50°C; 12 h; 3: With sodium methylate in methanol; N,N-dimethyl-formamide

1: With methanol; sodium methylate 2: With water; acetic acid

1: 2,3-dihydroxy-benzaldehyde With potassium carbonate in N,N-dimethyl-formamide T=20°C; 1 h; 2: 2-iodo-propane in N,N-dimethyl-formamide T=20°C; 20 h;