1,3-Dipropyl-2-thiourea → 2-[(Propylamino)(propylimino)methylthio]-3-quinoxalinecarboxylic acid ethyl ester, hydrochloride
Reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:7]([Cl:16])=[N:8][C:9]2[C:14]([N:15]=1)=[CH:13][CH:12]=[CH:11][CH:10]=2)=[O:5])[CH3:2].[CH2:17]([NH:20][C:21]([NH:23][CH2:24][CH2:25][CH3:26])=[S:22])[CH2:18][CH3:19]>CC(C)=O>[ClH:16].[CH2:1]([O:3][C:4]([C:6]1[C:7]([S:22][C:21]([NH:23][CH2:24][CH2:25][CH3:26])=[N:20][CH2:17][CH2:18][CH3:19])=[N:8][C:9]2[C:14]([N:15]=1)=[CH:13][CH:12]=[CH:11][CH:10]=2)=[O:5])[CH3:2]Participants
4
Procedure
2-Chloro-3-quinoxalinecarboxylic acid ethyl ester (3.551 g., 0.015 mole) and 2.405 g. (0.015 mole) of 1,3-di-n-propylthiourea were dissolved in acetone and heated at reflux for 11/2 hours. The solution was concentrated to a volume of 50 ml. and cooled. A small amount of solid was removed by filtration. The filtrate was further concentrated to a volume of 25 ml. and ether was added to turbidity. After the reaction mixture had been cooled the yellow solid was collected by filtration to give 2.77 g. (46.6%) of the product, m.p. 129°-130° C.