2-Methylbenzenesulfonic acid → tetrahydro-1-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)-3-(1,1-dimethylprop-2-ynyl)-6-methoxy-2(1H)-pyrimidinone

HRID 1288393Notes

Reaction equation

HRID 1288393 reaction equation
[F:1][C:2]([F:22])([F:21])[C:3]1[S:7][C:6]([N:8]2[CH:13]([OH:14])[CH2:12][CH2:11][N:10]([C:15]([CH3:19])([CH3:18])[C:16]#[CH:17])[C:9]2=[O:20])=[N:5][N:4]=1.[C:23]1(C)C(S(O)(=O)=O)=CC=CC=1>CO>[F:22][C:2]([F:1])([F:21])[C:3]1[S:7][C:6]([N:8]2[CH:13]([O:14][CH3:23])[CH2:12][CH2:11][N:10]([C:15]([CH3:18])([CH3:19])[C:16]#[CH:17])[C:9]2=[O:20])=[N:5][N:4]=1

Participants

4

Reactant 2

HCID 69252-Methylbenzenesulfonic acidHCID 21400099tetrahydro-1-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)-3-(1,1-dimethylprop-2-ynyl)-6-hydroxy-2(1H)-pyrimidinone

Product 1

HCID 21501689tetrahydro-1-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)-3-(1,1-dimethylprop-2-ynyl)-6-methoxy-2(1H)-pyrimidinone

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Tetrahydro-1-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)-3-(1,1-dimethylprop-2-ynyl)-6-hydroxy-2(1H)-pyrimidinone (7 grams), methyl alcohol (50 ml) and toluenesulfonic acid (0.2 grams) are charged into a glass reaction vessel equipped with a mechanical stirrer, thermometer and reflux condenser. The reaction mixture is then heated at reflux for a period of about 24 hours. After this time the mixture is stripped of unreacted alcohol under reduced pressure to yield a solid product. This product is then recrystallized to yield the desired product tetrahydro-1-(5-trifluoromethyl-1,3,4-thiadiazol-2yl)-3-(1,1-dimethylprop-2-ynyl)-6-methoxy-2(1H)-pyrimidinone.

Workup

  1. customequipped with a mechanical stirrer
  2. temperaturethermometer and reflux condenser
  3. temperatureThe reaction mixture is then heated
  4. temperatureat reflux for a period of about 24 hours
  5. customto yield a solid product
  6. customThis product is then recrystallized

Sources & evidence

ORD record
ord-b84b947e1dea4d58b6dc5ee9cd74e873
Source dataset
uspto-grants-1976_10
Patent number
US03988143

Reaction notes

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