Dimethylformamide → 1-(2',6'-Dimethylphenyl)-4-methylamino-1,2-dihydro-1,3,5-triazin-2-one methanesulfonate

Participants

Reaction Conditions

Reaction Steps

To 29.2 grams (0.4 mole) of N,N-dimethylformamide, heated to 50°-60° C., are added dropwise 50.5 grams (0.4 mole) of dimethyl sulfate while maintaining the temperature between 50° and 60° C. After the addition, the reaction mixture is heated at 70°-80° C. for four hours. The reaction mixture is diluted with acetonitrile (150 milliliters) and cooled to approximately 10° C. in an ice water bath. Then 44.0 grams (0.2 mole) of 1-(2',6'-dimethylphenyl)-3-methylamidinourea are added on one portion followed by the dropwise addition of 80.8 grams (0.8 mole) of triethylamine while keeping the temperature below 25° C. The reaction mixture is allowed to come to ambient temperature and stirred for one hour. The solvent is removed in vacuo and the residue diluted with water and the pH adjusted to 10 with ten percent (10%) aqueous sodium hydroxide. The aqueous layer is extracted with chloroform (3 times with 200 milliliters each time) and the combined extracts dried (MgSO4) and concentrated in vacuo. The residual solid is taken up in boiling acetonitrile (350 milliliters) and concentrated to approximately two-thirds of its volume on a steam bath. The hot solution is treated with 21.0 grams (0.22 mole) of methanesulfonic acid and on cooling a white crystalline solid deposits, which is filtered, washed with cold acetonitrile and vacuum dried at 80° C. for one hour to yield 60.6 grams (93%) of 1-(2',6'-dimethylphenyl)-4-methylamino-1,2-dihydro-1,3,5-triazin-2-one methanesulfonate, m.p. 264°-266° C. dec.

Provenance & Evidence