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4-Nitrophenyl chloroformate → 6-(4-Cyanophenyl)-2-methoxy-4-methyl-6H-pyrimidine-1,5-dicarboxylic acid 5-methyl ester 1-(4-nitrophenyl) ester

HRID 2362294
Notes
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Reaction equation

HRID 2362294 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:6]([C:14]2[CH:19]=[CH:18][C:17]([C:20]#[N:21])=[CH:16][CH:15]=2)[N:7]=[C:8]([O:12][CH3:13])[NH:9][C:10]=1[CH3:11])=[O:4].Cl[C:23]([O:25][C:26]1[CH:31]=[CH:30][C:29]([N+:32]([O-:34])=[O:33])=[CH:28][CH:27]=1)=[O:24]>C(Cl)Cl.N1C=CC=CC=1>[N+:32]([C:29]1[CH:28]=[CH:27][C:26]([O:25][C:23]([N:7]2[CH:6]([C:14]3[CH:15]=[CH:16][C:17]([C:20]#[N:21])=[CH:18][CH:19]=3)[C:5]([C:3]([O:2][CH3:1])=[O:4])=[C:10]([CH3:11])[N:9]=[C:8]2[O:12][CH3:13])=[O:24])=[CH:31][CH:30]=1)([O-:34])=[O:33]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 2

HCID 821294-Nitrophenyl chloroformateHCID 674375874-(4-Cyanophenyl)-2-methoxy-6-methyl-1,4-dihydropyrimidine-5-carboxylic acid methyl ester

Product 1

HCID 866782176-(4-Cyanophenyl)-2-methoxy-4-methyl-6H-pyrimidine-1,5-dicarboxylic acid 5-methyl ester 1-(4-nitrophenyl) ester

Reagents, catalysts & solvents 2

HCID 1049PyridineSolvent
HCID 6344
Dichloromethane
Solvent
2×

Conditions

Temperature
0 °C

Procedure

Intermediate 4 (1.56 g, 5.46 mmol) was dissolved in a mixture of DCM (25 mL) and pyridine (10 mL) and cooled using an ice bath. A solution of 4-nitrophenyl chloroformate (705 mg, 3.50 mmol) in DCM (25 mL) was added over 30 minutes. The reaction mixture was stirred for 1 hour at 0° C. and then the solvent was removed in vacuo. The resulting residue was purified by silica gel chromatography eluting with a gradient of 0-20% EtOAc in cyclohexane to gave the title compound as a yellow solid. The product thus obtained was used in the subsequent step without further analysis (2.0 g).

Workup

  1. temperaturecooled
  2. customthe solvent was removed in vacuo
  3. customThe resulting residue was purified by silica gel chromatography
  4. washeluting with a gradient of 0-20% EtOAc in cyclohexane

Sources & evidence

ORD record
ord-dc344d92d0684fb7bf23a36fdd584046
Source dataset
uspto-grants-2014_04
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08691826B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes