1H-imidazole in N,N-dimethyl-formamide 1) 5 gradC, 1.5 h; 2) room temp., 18 h;

1: 90 percent / diisobutylaluminium hydride / diethyl ether / -70 °C 2: 1) ethylbromide, Mg / 1) THF, colling with ice; 2) THF, 18 h, room temp. 3: 93 percent / imidazole / dimethylformamide / 1) 5 gradC, 1.5 h; 2) room temp., 18 h View Scheme

1: 1) ethylbromide, Mg / 1) THF, colling with ice; 2) THF, 18 h, room temp. 2: 93 percent / imidazole / dimethylformamide / 1) 5 gradC, 1.5 h; 2) room temp., 18 h View Scheme