反应详情

A filtered solution of disodium 9-ethyl-6,9-dihydro-4,6-dioxo-10-propyl-4H-pyrano-[3,2-g]-quinoline-2,8-dicarboxylate (75 g) in water (500 ml) was treated with a filtered solution of calcium nitrate (77 g) in water (500 ml). The mixture was stirred (2 hours) and then filtered. The solid obtained was washed with water and acetone, slurried first with water and then reslurried with acetone (500 ml). The solid was filtered off and dried in vacuo at 65° C. to give the title compound (73 g, contains 19.3% w/w water).

1. filtrationfiltered
2. customThe solid obtained
3. washwas washed with water and acetone
4. filtrationThe solid was filtered off
5. customdried in vacuo at 65° C.