反应详情

A solution of oxalyl chloride (Aldrich) (1.97 g, 15.2 mmoles) in dichloromethane (6 mL) was added in several portions to a stirred, ice-bath cooled solution of diisopropylformamide (Aldrich) (2.00 g, 15.17 mmoles) in dichloromethane (25 mL). The ice-bath was removed, and the solution was stirred at ambient temperature for 10 minutes. Solid 5-(4-ethylphenoxy)pyrimidin-4(3H)-one (1.00 g, 4.62 mmoles) was added, and the mixture was refluxed with stirring for 45 minutes. The solution was cooled and poured into a cold solution of vigorously stirred, saturated aqueous sodium bicarbonate (80 mL). The organic layer was washed with cold saturated aqueous sodium bicarbonate (80 mL), with cold water (80 mL) and then dried over sodium sulfate. The dry solution was spin evaporated in vacuo to give the intermediate 4-chloro-5-(4-ethylphenoxy)pyrimidine as an orange liquid. The liquid was dissolved in ethanol (50 mL) and trans-4-hydroxycyclohexylamine hydrochloride (Aldrich) (1.79 g, 11.45 mmoles) was added. A solution of sodium ethoxide, which had been prepared from sodium hydride (60% in mineral oil) (Aldrich) (0.41 g, 10.25 mmoles) and ethanol (15 mL) was added. The flask was rinsed with ethanol (10 mL), and the reaction was refluxed with stirring for 65 hours. The volatiles were removed by spin evaporate in vacuo to a small volume, and the residue was triturated with water (100 mL). The gummy residue was extracted with dichloromethane (150 mL). The solution was washed with water (80 mL), dried over sodium sulfate and spin evaporated in vacuo. This material was dissolved in ethyl acetate-hexanes and chromatographed on Silica Gel 60 (E. M. Science, 230-440 mesh) (13×4 cm column bed) using ethyl acetate as the eluent for the first 1.2 L and then with 5% ethanol in ethyl acetate. The fractions that contained homogeneous product were spin evaporated in vacuo to give a syrup. The pure 5-(4-ethylphenoxy)-4-(trans-4-hydroxycyclohexylamino)pyrimidine was converted to the hydrochloride by the same procedure described in Example 4. The residue was triturated under ethyl acetate to give a white solid which was collected, washed with ethyl acetate and dried in vacuo to give 1.25 g (77% yield) of 5-(4-ethylphenoxy)-4-(trans-4-hydroxycyclohexylamino)pyrimidine hydrochloride as a white solid, mp 245-243° C.

1. additionwas added
2. washThe flask was rinsed with ethanol (10 mL)
3. temperaturethe reaction was refluxed
4. customThe volatiles were removed by spin
5. customevaporate in vacuo to a small volume
6. customthe residue was triturated with water (100 mL)
7. extractionThe gummy residue was extracted with dichloromethane (150 mL)
8. washThe solution was washed with water (80 mL)
9. dry with materialdried over sodium sulfate
10. customspin evaporated in vacuo
11. dissolutionThis material was dissolved in ethyl acetate-hexanes
12. customchromatographed on Silica Gel 60 (E. M. Science, 230-440 mesh) (13×4 cm column bed)
13. customwere spin evaporated in vacuo
14. customto give a syrup
15. customThe residue was triturated under ethyl acetate
16. customto give a white solid which
17. customwas collected
18. washwashed with ethyl acetate
19. customdried in vacuo