Formaldehyde → Vandetanib

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

37% Aqueous formaldehyde (3.5 ml, 42 mmol) was added to a solution of 4-(4-bromo-2-fluoroanilino)-7-(1-(tert-butoxycarbonyl)piperidin-4-ylmethoxy)-6-methoxyquinazoline (3.49 g, 6.22 mmol), (prepared as described for the starting material in Example 1), in formic acid (35 ml). After heating at 95° C. for 4 hours the volatiles were removed under vacuum. The residue was suspended in water and the mixture was adjusted to pH 10.5 by slow addition of a solution of 2N sodium hydroxide. The suspension was extracted with ethyl acetate. The organic layer was washed with brine, dried MgSO4 and evaporated to give 4-(4-bromo-2-fluoroanilino)-6-methoxy-7-(1-methylpiperidin-4-ylmethoxy)quinazoline (2.61 g, 88%).

Herkunft & Nachweise