Ethylenediamine → Pixantrone

Beteiligte Stoffe

Reaktionsschritte

To a warm solution (55° C.) of ethylenediamine (154.4 mL, 2.29 mol) in THF (1400 mL), 6,9-difluorobenzo[g]isoquinoline-5,10-dione (70.1 g, 0.29 mol) was portionwise added over a period of 2.5 hours (about 4.6 g/10' each portion). The mixture was stirred for 3 hours at the same temperature and a blue precipitate was gradually formed. After one night stirring at 25° C., the suspension was filtered under nitrogen blanket, washed with THF (200 mL) and dried under vacuum (15 torr, 60° C., 3 h) to yield crude 6,9-bis[(2-aminoethyl)amino]benzo[g]isoquinoline-5,10-dione as dihydrofluoride salt (117 g).

Herkunft & Nachweise