反应详情

Step a) N-Butyllithium (35.9 mL, 89.7 mmol) was added dropwise to a cold (-78° C.) solution of 6-bromo-2-naphthol (20.0 g, 89.7 mmol) in THF (200 mL). After stirring for 10 minutes, tertbutyllithium (52.76 mL, 89.7 mmol) was added dropwise. The mixture was stirred for 30 min at -78° C, and two hours at -20° C. Then, hexamethylphosphoramide (15.6 mL, 89.7 mmol) was added to the reaction mixture. After stirring for 20 minutes. N,N-dimethylformamide (6.94 mL, 89.7 mmol) was added dropwise. The mixture was allowed to come to room temperature, stirred for 1 hour, and quenched with aqueous ammonium chloride. The mixture was poured into water, acidified with 2N HCL and extracted with EtOAc. The organic extracts were dried over MgSO4. Evaporation and purification by flash chromatography (hexane/EtOAc 3/1 ), gave a yellow solid (12.5 g, 81% yield, m.p. 173°-174 ° C.).

1. stirringThe mixture was stirred for 30 min at -78° C
2. customtwo hours
3. customat -20° C
4. stirringAfter stirring for 20 minutes
5. customto come to room temperature
6. stirringstirred for 1 hour
7. customquenched with aqueous ammonium chloride
8. additionThe mixture was poured into water
9. extractionextracted with EtOAc
10. dry with materialThe organic extracts were dried over MgSO4
11. customEvaporation and purification by flash chromatography (hexane/EtOAc 3/1 )