反应详情

温度

110 °C

A suspension of tert-butyl 5-bromo-3-[(1S)-1-(2-chloro-3-fluoro-6-hydroxyphenyl)ethyl]-1H-pyrrolo[2,3-b]pyridine-1-carboxylate (82.9 mg, 0.176 mmol), (R)-(−)-(2,2-dimethyl-1,3-dioxolan-4-yl)methyl p-toluenesulfonate (77.8 mg, 0.272 mmol), and potassium carbonate (102.5 mg, 0.7416 mmol) in DMF (3 mL) was subjected to microwave heating [Biotage, 110° C.] for 90 min. EtOAc was added to dilute the reaction mixture and a standard aqueous workup was performed. The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The crude was adsorbed onto a pre-filled silica gel loading cartridge [RediSepRf 5 g] and purified using the Teledyne/ISCO system [RediSepRf silica 12 gram GOLD column], eluting with a solvent system of 5-20% EtOAc:heptane. Fractions containing product were combined and concentrated in vacuo. The recovered material was dissolved in minimal MeOH, passed through a syringe filter, and purified a second time by MDP, under acidic conditions (formic acid). Fractions were combined and concentrated in vacuo, giving the title material as an off-white solid. 1H NMR (400 MHz, CDCl3): δ=8.42 (d, J=2.3 Hz, 1H), 7.50 (d, J=1.5 Hz, 1H), 7.47 (d, J=2.3 Hz, 1H), 7.01 (dd, J=9.1, 8.3 Hz, 1H), 6.70 (dd, J=9.1, 4.0 Hz, 1H), 4.91 (q, J=6.8 Hz, 1H), 4.01-4.18 (m, 2H), 3.81-3.89 (m, 1H), 3.78 (dd, J=7.7, 4.9 Hz, 1H), 3.73 (br s, 1H), 1.73 (d, J=7.1 Hz, 3H), 1.68 (s, 9H), 1.34 (d, J=14.9 Hz, 6H). MS (ES+): m/z 604.96/606.80/608.57 (21/100/24) [MH++Na]. HPLC: tR=4.13 min (ZQ3, nonpolar—5 min).

1. additionto dilute the reaction mixture
2. washThe combined organic layers were washed with brine
3. dry with materialdried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. custompurified
7. washeluting with a solvent system of 5-20% EtOAc
8. additionFractions containing product
9. concentrationconcentrated in vacuo
10. dissolutionThe recovered material was dissolved in minimal MeOH
11. custompassed through a syringe
12. filtrationfilter
13. custompurified a second time by MDP
14. concentrationconcentrated in vacuo