Pyridine → 4-(3-Bromo-4-fluorophenyl)-2-(methoxycarbonyl)-1-methyl-1,2,4,6,7,8-hexahydrocyclopenta[b]pyrazolo[4,3-e]pyridine-3,5-dione

HRID 1837087Notes

Reaction equation

HRID 1837087 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([CH:9]2[C:14]3[C:15](=[O:19])[NH:16][N:17]([CH3:18])[C:13]=3[NH:12][C:11]3[CH2:20][CH2:21][C:22](=[O:23])[C:10]2=3)[CH:5]=[CH:6][C:7]=1[F:8].Cl[C:25]([O:27][CH3:28])=[O:26].N1C=CC=CC=1>C(Cl)Cl>[Br:1][C:2]1[CH:3]=[C:4]([CH:9]2[C:14]3[C:15](=[O:19])[N:16]([C:25]([O:27][CH3:28])=[O:26])[N:17]([CH3:18])[C:13]=3[NH:12][C:11]3[CH2:20][CH2:21][C:22](=[O:23])[C:10]2=3)[CH:5]=[CH:6][C:7]=1[F:8]

Participants

5

Reactant 3

HCID 1049PyridineHCID 6586Methyl chloroformateHCID 101342284-(3-Bromo-4-fluorophenyl)-1-methyl-1,2,4,6,7,8-hexahydrocyclopenta[b]pyrazolo[4,3-e]pyridine-3,5-dione

Product 1

HCID 102746804-(3-Bromo-4-fluorophenyl)-2-(methoxycarbonyl)-1-methyl-1,2,4,6,7,8-hexahydrocyclopenta[b]pyrazolo[4,3-e]pyridine-3,5-dione

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

The product from Example 1 (0.1 g) in methylene chloride (10 mL) was stirred overnight with methyl chloroformate (0.04 mL) and pyridine (0.06 mL). The reaction mixture was evaporated under reduced pressure and the residue was chromatographed on silica gel eluting with 5% ethanol/methylene chloride to provide 0.038 g of the title compound. 1H NMR (DMSO-d6) δ 2.32 (t, 2H), 2.72 (m, 2H), 3.65 (s, 3H), 3.7 (s, 3H), 4.72 (s, 1H), 7.11 (m, 1H), 7.22 (t, 1H), 7.32 (dd, 1H), 10.80 (s, 1H); MS (ESI+) m/z 438 (M+H)+; Anal. Calcd for C18H15N3BrFO4: C, 49.54; H, 3.44; N, 9.63. Found: C, 49.69; H, 3.27; N, 9.72.

Workup

  1. customThe reaction mixture was evaporated under reduced pressure
  2. customthe residue was chromatographed on silica gel eluting with 5% ethanol/methylene chloride

Sources & evidence

ORD record
ord-7b731d5a911f4f82adf1b20978000549
Source dataset
uspto-grants-2004_08
Patent number
US06780872B2

Reaction notes

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