反应详情

2-Hydroxybenzaldehyde (1q, 0.90 ml, 8.4 mmol) and acetone (19, 1.24 ml, 16.8 mmol) were combined in ethanol (7 ml) and stirred for 15 min at room temperature. A solution of sodium hydroxide (0.5 g, 12.5 mmol) and water (2 ml) was added dropwise and the mixture stirred for 48 hr at room temperature. The mixture was neutralized with hydrochloric acid (1 N), extracted with ethyl acetate, washed with saturated sodium chloride, dried over magnesium sulfate, filtered and evaporated to afford a solid. The crude solid was recrystallized from tetrahydrofuran/hexane to give 0.36 g (26%) of a yellow solid: mp 136-137° C. [expected mp 139-140° C.]; 1H NMR: δ 2.42 (s, 3H), 6.92 (m, 2H), 7.03 (d, 1H, J=16.5 Hz), 7.24 (dt, 1H, J=7.0, 1.4 Hz), 7.45 (d, 1H, J=7.7 Hz), 7.88 (d, 1H, J=16.3 Hz), 8.00 (s, 1H); 13C NMR: δ 26.8, 116.6, 120.5, 127.5, 129.5, 131.9, 141.0, 156.1, 156.1, 201.3.

1. stirringthe mixture stirred for 48 hr at room temperature
2. extractionextracted with ethyl acetate
3. washwashed with saturated sodium chloride
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. customevaporated
7. customto afford a solid
8. customThe crude solid was recrystallized from tetrahydrofuran/hexane