1: anthranilic acid With trifluoroacetic acid; isopentyl nitrite in tetrahydrofuran T=25°C; 2.66667 h; Inert atmosphereSchlenk techniqueCooling with ice; 2: ethyl vinyl ether in 1,2-dichloro-ethane 5 h; Inert atmosphereSchlenk techniqueReflux;

n-butyllithium in hexane T=10 - 25°C; 3.33333 h; Inert atmosphereSchlenk technique;