Acrylonitrile → Tralopyril

HRID 429997

Reaction equation

HRID 429997 reaction equation
Cl[CH:2]([N:7]=[C:8](Cl)[C:9]1[CH:14]=[CH:13][C:12]([Cl:15])=[CH:11][CH:10]=1)[C:3]([F:6])([F:5])[F:4].[C:17](#[N:20])[CH:18]=[CH2:19].C(N(CC)C(C)C)(C)C.[Br:30]Br>CN(C)C=O.CCCCCCC.C(OCC)(=O)C>[Br:30][C:19]1[C:18]([C:17]#[N:20])=[C:8]([C:9]2[CH:14]=[CH:13][C:12]([Cl:15])=[CH:11][CH:10]=2)[NH:7][C:2]=1[C:3]([F:6])([F:5])[F:4]

Participants

8

Reactant 4

HCID 7855AcrylonitrileHCID 24408BromineHCID 81531DiisopropylethylamineHCID 72751476N-[1-chloro-(2,2,2-trifluoroethyl)]-4-chlorobenzimidoyl chloride

Product 1

HCID 183559TralopyrilYield 22.9%

Reagents, catalysts & solvents 3

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolventHCID 8900HeptaneSolvent

Procedure

A solution of N-[1-chloro-(2,2,2-trifluoroethyl)]-4-chlorobenzimidoyl chloride (5.80 g, 0.02 mol) and acrylonitrile (1.33 g, 0.025 mol) in N,N-dimethyl-formamide (15 mL) under a nitrogen atmosphere is treated with N,N-diisopropylethylamine (DIPEA, 7.8 g, 0.06 mol) over 30 minutes, heated to and held at 45-47° C. for 18 hours, cooled to room temperature, treated with bromine (3.2 g, 0.02 mol), stirred at room temperature for 1 hour, quenched with water, and extracted with ethyl acetate. The organic extract is concentrated in vacuo to obtain a residue. Flash column chromatography of the residue on silica gel, packed with 15% ethyl acetate in heptane and eluted with 20% ethyl acetate in heptane, gives the title product as white solid (1.6 g, 22.9% yield) which is identified by 1H and 19F NMR spectral analyses.

Workup

  1. temperatureheated to and
  2. customquenched with water
  3. extractionextracted with ethyl acetate
  4. extractionThe organic extract
  5. concentrationis concentrated in vacuo
  6. customto obtain a residue
  7. washeluted with 20% ethyl acetate in heptane

Sources & evidence

ORD record
ord-bf8e56d7736444a49c62ade5f4ecd55a
Source dataset
uspto-grants-2001_11
Patent number
US06320059B1

Linked notes

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