O-Phenylenediamine → methyl 2-(3-oxo-4H-quinoxalin-2-yl)acetate

HRID 443982Notes

Reaction equation

HRID 443982 reaction equation
[C:1]([C:7]([O:9][CH3:10])=[O:8])#[C:2][C:3](OC)=[O:4].[C:11]1([NH2:18])[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[NH2:17]>CO>[O:4]=[C:3]1[NH:18][C:11]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:17]=[C:2]1[CH2:1][C:7]([O:9][CH3:10])=[O:8]

Participants

4

Reactant 2

HCID 7243O-PhenylenediamineHCID 12980Dimethyl acetylenedicarboxylate

Product 1

HCID 310826methyl 2-(3-oxo-4H-quinoxalin-2-yl)acetate

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Dimethyl acetylenedicarboxylate (31.2 g., 0.22 mol.) was added slowly to a solution of o-phenylenediamine (21.6 g., 0.2 mol.) in methanol (400 ml.). The reaction mixture was stirred at room temperature for three hours and then cooled in an ice bath. The yellow solid was collected and washed with cold methanol. The solid was recrystallized from tetrahydrofuran (27.7 g., m.p. 230°-232° dec.).

Workup

  1. temperaturecooled in an ice bath
  2. customThe yellow solid was collected
  3. washwashed with cold methanol
  4. customThe solid was recrystallized from tetrahydrofuran (27.7 g., m.p. 230°-232° dec.)

Sources & evidence

ORD record
ord-15539353f62c486bb1da964ee7c3b411
Source dataset
uspto-grants-1981_04
Patent number
US04262123

Reaction notes

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