Acetic Anhydride → HCID 20268295, compound

HRID 1703204Notes

Reaction equation

HRID 1703204 reaction equation
[CH2:1]([N:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]([C:14]2[CH:22]=[CH:21][CH:20]=[CH:19][C:15]=2[C:16]([OH:18])=[O:17])=O)=[C:4]1[CH3:23])[CH3:2].[CH3:24][N:25]([CH3:35])[C:26]1[CH:31]=[CH:30][CH:29]=[C:28]([N:32]([CH3:34])[CH3:33])[CH:27]=1.C(OC(=O)C)(=O)C>C(O)C>[CH3:33][N:32]([CH3:34])[C:28]1[CH:27]=[C:26]([N:25]([CH3:35])[CH3:24])[CH:31]=[CH:30][C:29]=1[C:12]1([C:5]2[C:6]3[C:11](=[CH:10][CH:9]=[CH:8][CH:7]=3)[N:3]([CH2:1][CH3:2])[C:4]=2[CH3:23])[C:14]2[C:15](=[CH:19][CH:20]=[CH:21][CH:22]=2)[C:16](=[O:18])[O:17]1

Participants

5

Reactant 3

HCID 7918Acetic AnhydrideHCID 897151,3-Benzenediamine, N1,N1,N3,N3-tetramethyl-HCID 3084978Benzoic acid, 2-[(1-ethyl-2-methyl-1H-indol-3-yl)carbonyl]-

Product 1

HCID 20268295HCID 20268295, compoundYield 87.1%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

In a procedure similar to that described above in part B of this example, 12.28 g (0.04 mole) of 2-[(1-ethyl-2-methyl-3-indolyl)carbonyl]benzoic acid, prepared as described in part A above, 8.57 g (0.05 mole) of N,N,N',N'-tetramethyl-m-phenylenediamine and 6.0 ml of acetic anhydride were interacted with stirring at room temperature overnight. The reaction mixture was then diluted with 13.0 ml of ethanol and the precipitate which separated was filtered and washed with 6.0 ml of ethanol. The filter cake was then reslurried in 30 ml of methanol, filtered and washed successively with methanol and diethylether. The material was dried in vacuo to obtain 15.8 g of 3-[2,4-bis(dimethylamino)phenyl]-3-(1-ethyl-2-methyl-3-indolyl)phthalide (Formula III: R0 =R1 =R2 =R3 =Y1 =H; R=R5 =CH3 ; R4 =N(CH3)2 ; R6 =CH2CH3), a white crystalline solid which melted at 218°-222° C. The infrared spectrum was consistent with the structure. A benzene solution of the above product developed an intense grape-red color when streaked on a phenolic resin coated paper.

Workup

  1. customprepared
  2. customthe precipitate which separated
  3. filtrationwas filtered
  4. washwashed with 6.0 ml of ethanol
  5. filtrationfiltered
  6. washwashed successively with methanol and diethylether
  7. customThe material was dried in vacuo

Sources & evidence

ORD record
ord-10d7d8ce38fb48e5a35fe9c38049465d
Source dataset
uspto-grants-1982_09
Patent number
US04351768

Reaction notes

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