反应详情

温度

-78 °C

To a solution of 6-bromo-1,1-dimethyl-1,3-dihydro-isobenzofuran (1.41 g, 6.3 mmol) in anhydrous THF (10 mL) was added under Argon at −78° C. 2.5 M nBuLi in hexane (2.7 mL, 6.6 mmol) and after stirring for 0.5 h at −78° C. DMF (0.98 mL, 12.5 mmol) was added. After stirring for 2 h at −78° C. the reaction mixture was added to 0.5 N cold aq. HCl and extracted with Et2O. Combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The title compound was obtained after chromatographic purification (Combi-Flash, 40 g silicagel, hexane-EtOAc 95:5 to 50:50) as a light yellow oil: TLC (hexane-EtOAc 1:1) Rf=0.50; HPLC RtA=1.43 min; 1H NMR (400 MHz, CDCl3): δ10.02 (s, 1H), 7.78 (d, 1H), 7.65 (s, 1H), 7.36 (d, 1H), 5.11 (s, 2H), 1.53 (s, 6H).

1. extractionextracted with Et2O
2. washCombined organic layers were washed with brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. customevaporated