Dimethyl acetylenedicarboxylate → HCID 178418477, compound

HRID 2307841Notes

Reaction equation

HRID 2307841 reaction equation
[NH2:1][C:2]1[CH:11]=[C:10]([Cl:12])[CH:9]=[CH:8][C:3]=1[C:4]([O:6]C)=O.[C:13]([C:19]([O:21][CH3:22])=[O:20])#[C:14][C:15]([O:17][CH3:18])=[O:16].CC(C)([O-])C.[K+]>C(O)(C)(C)C>[Cl:12][C:10]1[CH:11]=[C:2]2[C:3]([C:4]([OH:6])=[C:13]([C:19]([O:21][CH3:22])=[O:20])[C:14]([C:15]([O:17][CH3:18])=[O:16])=[N:1]2)=[CH:8][CH:9]=1

Participants

5

Reactant 3

HCID 12980Dimethyl acetylenedicarboxylate2×HCID 80001Methyl 4-chloroanthranilateHCID 23665647Potassium tert-butoxide

Product 1

HCID 178418477HCID 178418477, compoundYield 47%

Reagents, catalysts & solvents 1

HCID 6386tert-ButanolSolvent

Procedure

A stirred mixture of methyl 2-amino-4-chlorobenzoate (2.50 g, 13.5 mmol) and dimethyl acetylenedicarboxylate (2.05 g, 14.4 mmol) in tert-butanol (22 ml) was refluxed for 7 hours under a nitrogen atmosphere. After adding additional dimethyl acetylenedicarboxylate (1.16 g, 8.13 mmol) and refluxing another 2.5 hours, the reaction mixture was allowed to cool to room temperature and potassium tert-butoxide (1.56 g, 13.9 mmol) was added in one portion. A precipitate formed and the resulting mixture was refluxed for 1.5 hours. The mixture was cooled to room temperature and filtered to separate the solids, which were washed with tert-butanol and diethyl ether. The solids were dissolved in water and acidified with 1 N sulfuric acid to form a precipitate. The resulting mixture was extracted with DCM and the combined extracts were washed with brine and water, dried over MgSO4, filtered and concentrated to give a green solid. Recrystallization of this material from methanol provided the title compound (1.15 g, 47%) as an off-white solid, mp 232-233° C.; MS (Cl):296 (M+H). Analysis for C13H10ClNO5: Calc'd: C, 52.81; H, 3.41; N, 4.74; Found: C, 52.75; H, 3.47; N, 4.69.

Workup

  1. temperaturewas refluxed for 7 hours under a nitrogen atmosphere
  2. temperaturerefluxing another 2.5 hours
  3. customA precipitate formed
  4. temperaturethe resulting mixture was refluxed for 1.5 hours
  5. temperatureThe mixture was cooled to room temperature
  6. filtrationfiltered
  7. customto separate the solids, which
  8. washwere washed with tert-butanol and diethyl ether
  9. dissolutionThe solids were dissolved in water
  10. customto form a precipitate
  11. extractionThe resulting mixture was extracted with DCM
  12. washthe combined extracts were washed with brine and water
  13. dry with materialdried over MgSO4
  14. filtrationfiltered
  15. concentrationconcentrated
  16. customto give a green solid
  17. customRecrystallization of this material from methanol

Sources & evidence

ORD record
ord-71786aa206af4fcd9218382e39854f98
Source dataset
uspto-grants-2004_12
Patent number
US06833368B2

Reaction notes

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