反应详情

A 2.34 g (12 mmol) sample of the compound from step 1c above was dissolved in 15 mL of DMF, and (Ph3P)2PdCl2 (0.6 mmol), CuI (0.74 mmol) and triethylamine (14.25 mmol) were added. The mixture was stirred at room temperature for 1 hour, then 3.14 g (14.4 mmol) of 2-iodo-3-hydroxypyridine (Lancaster Chem. Co.) was added. The reaction mixture was stirred at 60° C. for 16 hours. The solution was cooled, diluted with toluene, and the volatiles were removed under reduced pressure. The residue was dissolved in 1 N HCl, and this solution was extracted with ether. The acidic aqueous layer was adjusted to pH 10 with K2CO3, and this solution was extracted with CH2Cl2. The CH2Cl2 extract was washed with 20% Na,OH, dried over MgSO4, and evaporated. The residue was chromatographed on silica gel, eluting with 100:0 to 95:5 CHCl3 :MeOH to give 980 mg of title compound: 1H NMR (CDCl3, 300 MHz) δ 1.32 (s, 9H), 1.90-2.20 (m, 4H), 2.95-3.15 (m, 2H), 5.05 (m, 1H), 6.68 (s, 1H), 7.15 (br s, 1H), 7.67 (d, 1H, J=8 Hz), 8.48 (d, 1H, J=3 Hz); MS m/z: 289 (M+H)+.

1. stirringThe reaction mixture was stirred at 60° C. for 16 hours
2. temperatureThe solution was cooled
3. customthe volatiles were removed under reduced pressure
4. dissolutionThe residue was dissolved in 1 N HCl
5. extractionthis solution was extracted with ether
6. extractionthis solution was extracted with CH2Cl2
7. extractionThe CH2Cl2 extract
8. washwas washed with 20% Na,OH
9. dry with materialdried over MgSO4
10. customevaporated
11. customThe residue was chromatographed on silica gel
12. washeluting with 100:0 to 95:5 CHCl3