反应详情

A solution of 1.84 g. of sodium in 200 ml. of absolute alcohol was treated with 14.4 g. guanidine carbonate and 8.9 g. of 4'-(3-anilino-2-cyano-allyl)-2',6'-dimethoxy-formanilide and refluxed for 20 hours. Then, 200 ml. of water were added and the alcohol was removed under vacuum. After standing at room temperature for 2 hours, the crystals formed were removed by filtration with suction, washed with water and recrystallized from methanol, whereby there was obtained 2,4-diamino-5-(4-amino-3,5-dimethoxy-benzyl)-pyrimidine having a melting point of 215°-216° C.

1. customthe alcohol was removed under vacuum
2. customthe crystals formed
3. customwere removed by filtration with suction
4. washwashed with water
5. customrecrystallized from methanol