反应详情

A suspension of 4-chloro-7-hydroxy-6-methoxyquinazoline (11.5 g), prepared as described in Example 1, in dichloromethane (250 ml) was treated with triphenylphosphine (21.5 g), 1-(tert-butoxycarbonyl)-4-hydroxypiperidine (13.2 g) and di-tert-butyl azodicarboxylate (19 g) and the mixture stirred at ambient temperature overnight. The crude reaction mixture was concentrated to a third and loaded onto a silica column and eluted using ethyl acetate/petroleum ether (35/65) as solvent. The relevant fractions were combined and evaporated under vacuum to give 7-{[1-(tert-butoxycarbonyl)-piperidin-4-yl]oxy}-4-chloro-6-methoxyquinazoline as a white solid (20 g).

1. customprepared
2. customThe crude reaction mixture
3. concentrationwas concentrated to a third
4. washeluted
5. customevaporated under vacuum