Cl.[NH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[C:10]([NH2:13])[CH:11]=2)[N:6]=[CH:5][N:4]=1.C(N(CCC)CCC)CC.[CH:24]1([C:30](Cl)=[O:31])[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]1>N1C=CC=CC=1>[NH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[C:10]([NH:13][C:30]([CH:24]3[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]3)=[O:31])[CH:11]=2)[N:6]=[CH:5][N:4]=1A mixture of 4,6-diaminoquinazoline hydrochloride (12 g) and tripropylamine (31.7 g) in dry pyridine (120 ml) was stirred in an ice-bath for 1 hour. Cyclohexanecarbonyl chloride (12.1 g) was added dropwise during 4 hours and 20 minutes to the mixture at 70° C. The mixture was stirred for additional 1 hour at 5° C. Crushed ice was added to the reaction mixture. The mixture was stirred for 1 hour and concentrated under reduced pressure. After addition of water, the mixture was adjusted to pH 8 with sodium hydrogen carbonate to give precipitates which were separated by filtration, washed with water and dried. The precipitates were dissolved in a mixture of chloroform and methanol under heating. Insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to give crystalline 4-amino-6-cyclohexanecarboxamidoquinazoline (9.25 g).
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