Phenyl isocyanate → Carbamate

HRID 703691Notes

Reaction equation

HRID 703691 reaction equation
[C:1]1([N:7]=[C:8]=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[OH:10][CH:11]([C:16]([CH3:18])=[CH2:17])[C:12]([O:14]C)=[O:13].[N-]=C=O>C1C=CC=CC=1>[C:8](=[O:9])([O-:10])[NH2:7].[C:1]1([NH:7][C:8]([O:10][CH:11]([C:16]([CH3:18])=[CH2:17])[C:12]([O-:14])=[O:13])=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

6

Reactant 3

HCID 7672Phenyl isocyanateHCID 105034IsocyanateHCID 13461762Methyl 2-hydroxy-3-methylbut-3-enoate

Product 2

HCID 276CarbamateHCID 221509942-(N-phenylcarbamoyloxy)-3-methyl-3-butenoate

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

A benzene solution (50 ml) of phenyl isocyanate (1.19 g, 10 mmol) and methyl 2-hydroxy-3-methyl-3-butenoate (2.0 g, 10 mmol) was stirred at room temperature for 2 hours. It was confirmed by NMR and IR analysis of the reaction mixture that the isocyanate was completely consumed and a carbamate, 2-(N-phenylcarbamoyloxy)-3-methyl-3-butenoate, was produced. After the addition of triethylamine to the reaction mixture, the solution was further heated at reflux for 3 hours. The solvent was then removed under reduced pressure and methanol (10 ml) was added to the resulting residue to precipitate white crystals of the desired product. These crystals (1.51 g) were separated by filtration and identified as 3-phenyl-5-isopropylidne-1,3-oxazolidine-2,4-dione by NMR and IR analysis.

Workup

  1. customwas completely consumed

Sources & evidence

ORD record
ord-b0828c87b1c9472f9dec2aab5fc0fbd7
Source dataset
uspto-grants-1991_01
Patent number
US04983751

Reaction notes

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