反应详情

A solution of 2.76 ml of 3-chloroaniline in 7 ml of dioxan is added dropwise to 5.0 g of 4-chloro-7-fluoro-6-nitro-quinazoline in 40 ml of methylene chloride at 15° C. within 15 minutes. The reaction mixture is stirred for a further 15 minutes at this temperature before being poured onto 100 ml of n-hexane for working up. The mixture is stirred for about one hour while cooling with an ice bath, then the precipitate formed is filtered off. The hydrochloride thus obtained is suspended in 30 ml of methanol, made alkaline with triethylamine while cooling with an ice bath and combined with 100 ml of water. The precipitate formed is suction filtered and washed with water. The crude product is purified by chromatography on a silica gel column with methylene chloride/methanol (20:1) as eluant. Yield: 3.50 g (50% of theory), Melting point: 223-225° C. Mass spectrum (ESI*): m/z=319, 321 [M+H]*

1. stirringThe mixture is stirred for about one hour
2. temperaturewhile cooling with an ice bath
3. customthe precipitate formed
4. filtrationis filtered off