1: naphthalene-1-carboxylic acid With 1,1'-carbonyldiimidazole in tetrahydrofuran T=20°C; 10 h; 2: magnesium salt of monomethyl malonic acid in tetrahydrofuran T=20°C; 18 h; Further stages.;

1: carbonic acid dimethyl ester With sodium hydride T=20°C; Inert atmosphere; 2: methyl 1-naphthyl ketone 4 h; Inert atmosphereReflux;

samarium; iodine in tetrahydrofuran 20 h; Heating;

1: mono-methyl malonate potassium salt With magnesium chloride in tetrahydrofuran T=65°C; 5 h; Inert atmosphere; 2: N-(1-naphthoyl)imidazole in tetrahydrofuran T=30°C; 24 h; Inert atmosphere;