Ammonia → 6-Methyl-2,4-pyrimidinediamine

Participants

Reaction Steps

A mixture of 50.0 grams (0.348 mole) of 2-amino-4-chloro-6-methylpyrimidine (commercially available) and 100 mL of aqueous 30% ammonia in 400 mL of methanol was placed in a high pressure vessel and heated to 130°-165° C. under a pressure of 140°-250 psig, where it was stirred for 13 hours. After this time, the reaction mixture was allowed to cool to ambient temperature. The reaction vessel was then opened and the reaction mixture was removed. The reaction vessel was washed with 200 mL of methanol, and the wash was combined with the reaction mixture. The combination was concentrated under reduced pressure to a residual solid. The solid was then stirred for 2 hours at ambient temperature with 100 mL of aqueous 30% ammonia. The mixture was cooled to 0° C., and the solid was collected by filtration. The solid was dried, yielding 40.8 grams of 2,4-diamino-6-methylpyrimidine. The NMR spectrum was consistent with the proposed structure.

Provenance & Evidence