반응 #162490

반응 방정식

6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridine-5-carbonitrile

Xantphos

cesium carbonate

3,3-difluoroazetidine hydrochloride

→

title compound

수율 29.0%

6-(3,3-Difluoroazetidin-1-yl)-1-methyl-1H-pyrrolo[3,2-b]pyridine-5-carbonitrile

수율 29.0%

용매

EtOAc

dioxane

반응 조건

후처리

1. 1
   온도heating
2. 2
   세척then washed with saturated aqueous ammonium chloride (100 mL)
3. 3
   여과filtered
4. 4
   기타to remove solids
5. 5
   기타The layers were separated
6. 6
   세척the organic layer was washed with brine
7. 7
   건조dried over MgSO4
8. 8
   농축concentrated in vacuo
9. 9
   기타The crude product was purified on a silica gel column (80 g)
10. 10
    세척eluting with a 0-60% ethyl acetate in hexanes

실험 절차

To a 5 mL vial were added 6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridine-5-carbonitrile (500 mg, 2.12 mmol), Xantphos (123 mg, 0.212 mmol), palladium (II) acetate (47.6 mg, 0.212 mmol), cesium carbonate (1380 mg, 4.24 mmol) and 3,3-difluoroazetidine hydrochloride (549 mg, 4.24 mmol) in dioxane (5.0 mL). The resulting yellow suspension was heated to 110° C. for 22 hours. LC/MS showed about 50% conversion. More palladium (II) acetate (50 mg) was added and heating was continued at 110° C. for 2 days. The solution was diluted with EtOAc (up to 100 mL) and then washed with saturated aqueous ammonium chloride (100 mL) and filtered to remove solids. The layers were separated, and the organic layer was washed with brine, dried over MgSO4, and concentrated in vacuo. The crude product was purified on a silica gel column (80 g) eluting with a 0-60% ethyl acetate in hexanes to give the title compound as a yellow solid (152 mg, 29%). 1H NMR (400 MHz, DMSO-d6) δ ppm 3.79 (s, 3 H), 4.55 (t, J=12.4 Hz, 4 H), 6.55 (dd, J=3.3, 0.8 Hz, 1 H), 7.38 (d, J=0.8 Hz, 1 H), 7.69 (d, J=3.5 Hz, 1 H); ESI-MS m/z [M+H]+ calc'd for C12H10F2N4, 249; found 249.

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