Bromine → 4-(3-bromo-2-{2-[(2R)-2-methylpyrrolidin-1-yl]ethyl}-1-benzofuran-5-yl)benzonitrile

HRID 494848Notes

Reaction equation

[CH3:1][C@@H:2]1[CH2:6][CH2:5][CH2:4][N:3]1[CH2:7][CH2:8][C:9]1[O:10][C:11]2[CH:17]=[CH:16][C:15]([C:18]3[CH:25]=[CH:24][C:21]([C:22]#[N:23])=[CH:20][CH:19]=3)=[CH:14][C:12]=2[CH:13]=1.[Br:26]Br.[O-]S([O-])=O.[Na+].[Na+]>C(O)(C(F)(F)F)=O>[Br:26][C:13]1[C:12]2[CH:14]=[C:15]([C:18]3[CH:19]=[CH:20][C:21]([C:22]#[N:23])=[CH:24][CH:25]=3)[CH:16]=[CH:17][C:11]=2[O:10][C:9]=1[CH2:8][CH2:7][N:3]1[CH2:4][CH2:5][CH2:6][C@H:2]1[CH3:1]

Participants

Conditions

Temperature: 25 °C

Procedure

The product from Example 1D (2.5 g (5.2 mmol) and trifluoroacetic acid (40 mL) (TFA) were combined and stirred at 25° C. for 10 min. The mixture was slowly treated with a solution of Br2 (450 μL, 7.8 mmol) in TFA (10 mL). The mixture was allowed to stir at 25° C. for 1 h and then treated with saturated aqueous Na2SO3. The mixture was concentrated and redissolved in 50 mL ethyl acetate. The organic phase was washed with 1M NaOH, dried, and concentrated under reduced pressure to provide the title compound (2.1 g, 97% yield). 1HNMR (300 MHz, CD3OD) δ 1.16 (d, 3H, J=6.1 Hz), 1.42 (m, 1H), 1.78 (m, 2H), 1.98 (m, 1H), 2.32 (m, 1H), 2.50 (m, 2H), 3.11 (m, 2H), 3.28 (m, 2H), 7.58-7.70 (m, 3H), 7.82 (m, 4H); MS (ESI) m/e 409 (M+H)+.

Workup

stirringto stir at 25° C. for 1 h
concentrationThe mixture was concentrated
dissolutionredissolved in 50 mL ethyl acetate
washThe organic phase was washed with 1M NaOH
customdried
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-cb1fbaea42144b67ac62a68d81fde0e3
Source dataset: uspto-grants-2009_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07538138B2

Reaction notes

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