1: dibenzopyrrole With caesium carbonate in N,N-dimethyl-formamide T=20°C; 1 h; 2: 1-bromo-2-methoxyethane in N,N-dimethyl-formamide T=90°C; 5 h;

1: dibenzopyrrole With n-butyllithium in tetrahydrofuran T=20°C; 2 h; Inert atmosphere; 2: p-toluenesulfonic-acid-(2-methoxyethyl)-ester in tetrahydrofuran 2 h; Inert atmosphereCooling with ice;