反应详情

A mixture of 3-(2-chloro-phenyl)-6-fluoro-3,4-dihydro-quinazolin-4-one-2-carboxaldehyde (0.439 g, 1.45 mmol), 2-aminonicotinonitrile (0.150 g, 1.26 mmol) and anhydrous sodium sulfate (2.1 g, 14.5 mmol) in acetic acid (10 mL) was stirred at ambient temperature for 24 hours. The mixture was now warmed to 80° C. for 24 hours. The reaction was cooled to ambient temperature and sodium triacetoxyborohydride (1.3 g, 6.13 mmol) was added portionwise. The reaction was stirred for 16 hours and then quenched by carefully pouring it into a mixture of saturated aqueous sodium bicarbonate (150 mL) and ethyl acetate (20 mL). This quenching solution was stirred 30 min. The phases were separated and the organic layer was washed with brine, dried over magnesium sulfate and concentrated. The residue was flash chromatographed on silica gel (50 g) with elution proceeding as follows: 20% ethyl acetate/hexane (350 mL), nil; 30% ethyl acetate/hexane (350 mL), unweighed 3-(2-chloro-phenyl)-6-fluoro-3,4-dihydro-quinazolin-4-one-2-methanol; 40% ethyl acetate/hexane (400 mL), impure product. This partially purified product was flash chromatographed on silica gel (20 g) with elution proceeding as follows: 5% ethyl acetate/hexane (1000 mL), nil; 10% ethyl acetate/hexane (1000 mL), nil; 15% ethyl acetate/hexane (750 mL), nil; (500 mL), unweighed impurity; 20% ethyl acetate/hexane (1000 mL), nil; (1000 mL), unweighed impurity; 30% ethyl acetate/hexane (600 mL), 0.050 g (10%) of 2-{[3-(2-chloro-phenyl]-6-fluoro-4-oxo-3,4-dihydro-quinazolin-2-ylmethyl]-amino}-nicotinonitrile as a light tan solid which had: mp 145-150° C.; 1H NMR δ 8.16 (d, J=5 Hz, 1 H), 7.93 (dd, J=3, 8 Hz, 1 H), 7.84 (dd, J=5, 9 Hz, 1 H), 7.71-7.63 (m, 2 H), 7.56-7.51 (m, 3 H), 7.40 (d, J=7 Hz, 1 H), 6.85 (s, 1 H), 6.62 (dd, J=5, 7 Hz, 1 H), 4.23 (ABq, Δv1-3=74 Hz, J=19 Hz, 2 H); APCI MS m/z=406.2 (P+1).

1. temperatureThe mixture was now warmed to 80° C. for 24 hours
2. temperatureThe reaction was cooled to ambient temperature
3. stirringThe reaction was stirred for 16 hours
4. customquenched
5. additionby carefully pouring it
6. additioninto a mixture of saturated aqueous sodium bicarbonate (150 mL) and ethyl acetate (20 mL)
7. stirringThis quenching solution was stirred 30 min
8. customThe phases were separated
9. washthe organic layer was washed with brine
10. dry with materialdried over magnesium sulfate
11. concentrationconcentrated
12. customchromatographed on silica gel (50 g) with elution proceeding
13. customchromatographed on silica gel (20 g) with elution proceeding