sodium hydride in N,N-dimethyl-formamide T=0°C; 3 h;

1: 3,4-(methylenedioxy)phenol; chloroform With sodium hydroxide in ethanol; water T=80°C; Formylation; 6 h; Heating; 2: chloromethyl methyl ether With sodium hydride in tetrahydrofuran T=25°C; methoxymethylation; 0.5 h;