Ethanethiol → 2,4-Diamino-5-(3-ethoxy-4-isopropenyl-5-methoxybenzyl)-pyrimidine

Reaction equation

[CH2:1](S)[CH3:2].[H-].[Na+].[NH2:6][C:7]1[N:12]=[C:11]([NH2:13])[C:10]([CH2:14][C:15]2[CH:20]=[C:19]([O:21]C)[C:18]([C:23]([CH3:25])=[CH2:24])=[C:17]([O:26][CH3:27])[CH:16]=2)=[CH:9][N:8]=1>CN(C)C=O>[NH2:6][C:7]1[N:12]=[C:11]([NH2:13])[C:10]([CH2:14][C:15]2[CH:16]=[C:17]([O:26][CH3:27])[C:18]([C:23]([CH3:25])=[CH2:24])=[C:19]([O:21][CH2:1][CH3:2])[CH:20]=2)=[CH:9][N:8]=1

Participants

Procedure

A solution of 16.1 ml. of ethylmercaptan in 130 ml. of dimethylformamide was added dropwise while stirring and gassing with nitrogen to a suspension of 10.4 g. of sodium hydride (50%) in 130 ml. of dimethylformamide. After the evolution of gas had ceased, the mixture was stirred at room temperature for an additional 15 minutes and treated with a solution 13 g. of 2,4-diamino-5-(4-isopropenyl-3,5-dimethoxybenzyl)-pyrimidine in 260 ml. of dimethylformamide. The mixture was stirred at 120° C. for 6 hours. The solvent was removed under a high vacuum. The solid residue was dissolved in water, filtered and the filtrate was adjusted to pH 4 with 1-N hydrochloric acid. The acid solution was then adjusted to pH 8 with ammonia and the solid crude product was isolated in a yield of 98%. Recrystallization from methanol yielded pure 2,4-diamino-5-(3-hydroxy-4-isopropenyl-5-methoxybenzyl)-pyrimidine, having a melting point of 218°-219° C.