1: dibenzopyrrole With sodium hydride in N,N-dimethyl-formamide; mineral oil T=60°C; 0.333333 h; Inert atmosphere; 2: methyl 3-bromo-propionate in N,N-dimethyl-formamide; mineral oil T=60°C; 4 h; Inert atmosphere;

potassium hydride in N,N-dimethyl-formamide T=20°C; Alkylation; 18 h;

1: dibenzopyrrole With sodium hydride in tetrahydrofuran T=20°C; 2 h; 2: acrylic acid methyl ester in tetrahydrofuran T=20°C; Michael reaction; 16 h; Further stages.;

in methanol; water; hydrazine hydrate