反应详情

To a solution of trans-1,2-cyclopentanediol [manufactured by Aldrich Co., cf. J. Chem. Soc., 4026 (1952)] (5.39 g) and 2,4-dichloroquinazoline [cf. J. Am. Chem. Soc., 53, 3867 (1931)] (9.58 g) in dimethylformamide (50 ml) is added gradually 60% sodium hydride (in oil) (2.49 g) with stirring under ice-cooling, and the mixture is stirred at room temperature for 1 hour and 20 minutes. The reaction mixture is diluted with ethyl acetate and washed with water 6 times. The resulting ethyl acetate solution is dried over anhydrous magnesium sulfate and is evaporated to dryness under reduced pressure, and the residue is briefly purified with medium pressure liquid column chromatography (eluent, chloroform) to give an oily substance. The oily substance thus obtained is dissolved in dioxane (27 ml), and the mixture is slowly added dropwise to a solution of piperazine (9.67 g) in dioxane (36 ml) with stirring at 70° C., and the mixture is stirred at the same temperature for one hour and 10 minutes. The reaction mixture is diluted with ethyl acetate, washed with water, and dried over anhydrous magnesium sulfate. The resulting solution is evaporated to dryness under reduced pressure, and the residue is washed with acetone, and the resulting crystals are recrystallized from acetone to give 4-[trans-(2-hydroxycyclopentan-1-yl)oxy]-2-(1-piperazinyl)quinazoline (2.89 g) as crystals.

1. temperaturecooling
2. stirringthe mixture is stirred at room temperature for 1 hour and 20 minutes
3. washwashed with water 6 times
4. dry with materialThe resulting ethyl acetate solution is dried over anhydrous magnesium sulfate
5. customis evaporated to dryness under reduced pressure
6. customthe residue is briefly purified with medium pressure liquid column chromatography (eluent, chloroform)
7. customto give an oily substance
8. customThe oily substance thus obtained
9. stirringwith stirring at 70° C.
10. stirringthe mixture is stirred at the same temperature for one hour and 10 minutes
11. washwashed with water
12. dry with materialdried over anhydrous magnesium sulfate
13. customThe resulting solution is evaporated to dryness under reduced pressure
14. washthe residue is washed with acetone
15. customthe resulting crystals are recrystallized from acetone