1: 2-hydroxynaphthalene-1-carbaldehyde With potassium carbonate; caesium carbonate in N,N-dimethyl-formamide T=20°C; 0.5 h; Inert atmosphere; 2: 2-iodo-propane in N,N-dimethyl-formamide T=20°C; Inert atmosphere;

1: With trichlorophosphate T=0 - 75°C; Vilsmeier-Haack reaction; 12 h; 2: With water; sodium hydroxide Vilsmeier-Haack reaction;

sodium hydride in N,N-dimethyl-formamide 6 h; Ambient temperature;