p-Toluenesulfonic acid → HCID 20367264, compound

Reaction equation

C([O:3][C:4](=O)[CH:5]=[C:6]([NH2:10])OCC)C.C1(C)C=CC(S(O)(=O)=O)=CC=1.[Cl:23][C:24]1[C:32]([Cl:33])=[CH:31][CH:30]=[CH:29][C:25]=1[CH2:26][NH:27][NH2:28]>C(O)C>[NH2:10][C:6]1[NH:28][N:27]([CH2:26][C:25]2[CH:29]=[CH:30][CH:31]=[C:32]([Cl:33])[C:24]=2[Cl:23])[C:4](=[O:3])[CH:5]=1

Participants

Procedure

16.7 g of β-amino-β-ethoxyacrylic acid ethyl ester and 1 g of p-toluenesulphonic acid were dissolved in 100 ml of ethanol and 20.2 g of 2,3-dichlorobenzylhydrazine were added. After standing overnight at room temperature, the precipitate which had formed was filtered off and dissolved in 2 N sodium hydroxide solution. The alkaline solution was again extracted with ether and subsequently slightly acidified with dilute acetic acid. Hereupon the compound identified above precipitated and after recrystallisation from ethanol the melting point was 161°-162° C. Yield: 11 g (40%).