2-Chloroethanol → 4-Bromo-1-(2-chloroethyl)-1H-pyrazole

HRID 1952450Notes

Reaction equation

HRID 1952450 reaction equation
[Br:1][C:2]1[CH:3]=[N:4][NH:5][CH:6]=1.[Cl:7][CH2:8][CH2:9]O.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CCOC(/N=N/C(OCC)=O)=O>C1COCC1>[Br:1][C:2]1[CH:3]=[N:4][N:5]([CH2:9][CH2:8][Cl:7])[CH:6]=1

Participants

6

Reactant 4

HCID 342-ChloroethanolHCID 11776TriphenylphosphineHCID 163754-BromopyrazoleHCID 5462977Diethyl azodicarboxylate

Product 1

HCID 518920744-Bromo-1-(2-chloroethyl)-1H-pyrazole

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 4-bromo-1H-pyrazole (5 g, 34.02 mmol), 2-chloroethanol (2.7 mL, 40.82 mmol) and PPh3 (10.71 g, 40.82 mmol) and in THF (68 mL) at 0° C. was added DEAD (6.4 mL, 40.8 mmol). The mixture was allowed to warm-up to room temperature and stirred overnight. It was then concentrated under reduced pressure, the residue was treated with ether and the resultant suspension was filtered. The filtrate was collected and concentrated under reduced pressure to afford the title compound 75 which was used in the next step without further purification. MS (m/z). 209.0 (M+H).

Workup

  1. concentrationIt was then concentrated under reduced pressure
  2. additionthe residue was treated with ether
  3. filtrationthe resultant suspension was filtered
  4. customThe filtrate was collected
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-c9b55860f6cb4911b4114ad32a1ef24f
Source dataset
uspto-grants-2013_03
Patent number
US08404846B2

Reaction notes

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