2-Amino-4,6-dimethoxypyrimidine → Amidosulfuron

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반응 단계

32.3 g of 1-[(N-methylsulfonyl-N-methylamino)-sulfonyl]-3-(N-methylsulfonyl-N-methylamino)urea are slurried in 500 ml of chlorobenzene, 15.5 g of 2-amino-4,6-di-methoxypyrimidine are added at 80° C. with stirring, and the mixture is heated for 3 hours at 80° C. After cooling to 20° C., the precipitate is filtered off and washed with 100 ml of chlorobenzene. 36.4 g of the desired product are obtained with a purity of 98.1%, corresponding to a yield of 96.8% of theory. The melting point for the product is 183°-185° C. 5.1 g of N-methylmethanesulfonamide are recovered from the filtrate by distillation, corresponding to a yield of 92.7% of theory.

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