p-Toluenesulfonic acid → HCID 13730722, compound

HRID 2291779Notes

Reaction equation

HRID 2291779 reaction equation
[C:1]([C:3]([N:8]1[C:12](=[O:13])[CH:11]=[C:10]([NH:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=2[CH:21]=O)[C:9]1=[O:23])([CH3:7])[CH:4]([CH3:6])[CH3:5])#[N:2].C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C(C)=CC=CC=1>[CH:4]([C:3]([CH3:7])([N:8]1[C:12](=[O:13])[C:11]2[C:10](=[N:14][C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=3[CH:21]=2)[C:9]1=[O:23])[C:1]#[N:2])([CH3:6])[CH3:5]

Participants

4

Reactant 2

HCID 6101p-Toluenesulfonic acidHCID 13730723HCID 13730723, compound

Product 1

HCID 13730722HCID 13730722, compoundYield 81%

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

A solution of N-(1-cyano-1,2-dimethylpropyl)-2-(o-formylanilino)maleimide (7.19 g, 0.023 mol) in xylene (300 ml) containing p-toluenesulfonic acid (0.3 g, 0.0016 mol) is heated at reflux for 4 hours using a Dean-Stark trap to collect the eliminated water. The reaction is cooled, evaporated under reduced pressure and dissolved in hot ethyl acetate which is passed through a 3 inch silica gel column. The ethyl acetate fractions eluted are combined to give a solid, mp 195°-195.5° C., 5.51 g, (81%) of 1,3-dihydro-α-isopropyl-α-methyl-1,3-dioxo-2-H-pyrrolo[3,4-b]quinoline-2-acetonitrile.

Workup

  1. temperatureis heated
  2. temperatureat reflux for 4 hours
  3. customto collect the eliminated water
  4. temperatureThe reaction is cooled
  5. customevaporated under reduced pressure
  6. dissolutiondissolved in hot ethyl acetate which
  7. washThe ethyl acetate fractions eluted

Sources & evidence

ORD record
ord-1183656172834500bbe29fce91fc8ac3
Source dataset
uspto-grants-1989_01
Patent number
US04798619

Reaction notes

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