反应详情

A solution of 3-methyl-1-(pyrazin-2-yl)butan-1-one (1.0 g, 6.1 mmol) in 120 mL of a 19/1 mixture of tert-butanol and benzene was irradiated using a 6 W 366 nm lamp (TLC lamp) in a pyrex glass tube. The conversion was 50% after 16 h and 80% after 40 h. At this point the volatiles were removed in vacuo and the material was purified by column chromatography (silica, EtOAc/heptanes 1/4) to afford 2,2-dimethyl-1-(pyrazin-2-yl)cyclopropanol as a reddish-brown oil (375 mg; 38%). 1H NMR (CDCl3) 0.90 (3H, s), 1.00 (2H, d), 1.40 (2H, s), 3.20 (1H, s), 8.42 (1H, m), 8.50 (1H, m), 8.76 (1H, m).

1. customwas irradiated
2. customafter 16 h
3. customAt this point the volatiles were removed in vacuo
4. customthe material was purified by column chromatography (silica, EtOAc/heptanes 1/4)