反应详情

温度

0 °C

4-Bromo-5H-cyclopenta[c]pyridin-7(6H)-one (1.01 g, 4.76 mmol), titanium (IV) isopropoxide (2.79 mL, 9.53 mmol) and ammonia, 2M in MeOH (11.9 mL, 23.8 mmol) were stirred at RT for 5 h. The reaction mixture was cooled to 0° C. and NaBH4 (270 mg, 7.14 mmol) was added in three portions over 20 min; the resulting mixture was stirred at RT for an additional 1.5 h. The reaction was quenched by pouring it into ammonium hydroxide (25%) (24.8 mL, pH 9-10), the precipitate was filtered and washed with AcOEt (3×, each time suspended in AcOEt and stirred for 5 min). The organic layer was separated and the remaining aqueous layer was extracted with EtOAc. The combined organic extracts were extracted with aq. 1 M HCl. The acidic aqueous extracts were washed with EtOAc (1×), then treated with aq. sodium hydroxide (2 M) to give a pH of 10-12, and extracted with EtOAc (3×). The combined organic extracts were washed with brine, dried (Na2SO4) and concentrated in vacuo to afford the title compound (530 mg, 52% yield in 70% purity, determined by 1H-NMR) as dark green amorphous solid. MS: 213.0 (M+H+, 1Br).

1. customThe reaction was quenched
2. additionby pouring it into ammonium hydroxide (25%) (24.8 mL, pH 9-10)
3. filtrationthe precipitate was filtered
4. washwashed with AcOEt (3×
5. stirringstirred for 5 min)
6. customThe organic layer was separated
7. extractionthe remaining aqueous layer was extracted with EtOAc
8. extractionThe combined organic extracts were extracted with aq. 1 M HCl
9. washThe acidic aqueous extracts were washed with EtOAc (1×)
10. additiontreated with aq. sodium hydroxide (2 M)
11. customto give a pH of 10-12
12. extractionextracted with EtOAc (3×)
13. washThe combined organic extracts were washed with brine
14. dry with materialdried (Na2SO4)
15. concentrationconcentrated in vacuo