Phosgene → HCID 13670415, compound

HRID 364646Notes

Reaction equation

HRID 364646 reaction equation
[F:1][C:2]1[C:8]([O:9][CH2:10][CH3:11])=[C:7]([O:12][CH2:13][CH3:14])[CH:6]=[CH:5][C:3]=1[NH2:4].[C:15](Cl)(Cl)=[O:16]>C1(C)C=CC=CC=1>[F:1][C:2]1[C:8]([O:9][CH2:10][CH3:11])=[C:7]([O:12][CH2:13][CH3:14])[CH:6]=[CH:5][C:3]=1[N:4]=[C:15]=[O:16]

Participants

4

Reactant 2

HCID 6371PhosgeneHCID 134544923,4-Diethoxy-2-fluoroaniline

Product 1

HCID 13670415HCID 13670415, compound

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent2×

Procedure

2-Fluoro-3,4-diethoxyaniline (1.99 g) in toluene (20 ml) was dropwise added to a toluene solution containing 10 g of phosgene at 10° to 20° C. The resulting mixture was gradually heated and, after being refluxed for 30 minutes, cooled to room temperature. The solvent was removed by distillation under reduced pressure to give 2-fluoro-3,4-diethoxyphenyl isocyanate. The thus obtained crude substance was added to a toluene solution (50 ml) containing triethylamine (1.0 g) and isopropanol (1.0 g). The resultant mixture was allowed to stand at room temperature for 12 hours, poured into ice-water and extracted with ethyl acetate. The extract was washed with water, dried over magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography using a mixture of toluene and ethyl acetate as the eluent to give isopropyl N-(2-fluoro-3,4-diethoxyphenyl)carbamate (Compound No. 1) (1.99 g) in a yield of 69.8%.

Workup

  1. temperatureThe resulting mixture was gradually heated
  2. temperatureafter being refluxed for 30 minutes
  3. customThe solvent was removed by distillation under reduced pressure

Sources & evidence

ORD record
ord-130e1f5bec6a4961836f30934d7100a6
Source dataset
uspto-grants-1986_08
Patent number
US04605668

Reaction notes

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