反应详情

EX-645A) 3-Hydroxybenzaldehyde (5.60 g, 45.9 mmol) and 2-iodopropane (7.86-46.2 mmol) were dissolved in 50 mL of isopropanol. Potassium carbonate (20 g, 145 mmol) was added, and the mixture was heated to reflux for 8 h, at which time TLC analysis indicated that the reaction had gone to completion. Water was added to dissolve all solids, and the mixture was extracted with ether (3×). The combined ether layer was washed with water, 2 M NaOH, again with water until clear (4×), and finally with brine. The solution was dried over MgSO4, filtered, and evaporated to give 5.03 g (67%) of the desired 3-isopropoxybenzaldehyde product as a pale oil. 1H NMR (C6D6) δ 9.62 (s, 1H), 7.29 (s, 1H), 7.03 (m, 1H), 6.91 (t, 1H), 6.84 (m, 1H), 4.03 (septet, 1H), 0.96 (d, 6H).

1. temperaturethe mixture was heated
2. temperatureto reflux for 8 h, at which time TLC analysis
3. dissolutionto dissolve all solids
4. extractionthe mixture was extracted with ether (3×)
5. washThe combined ether layer was washed with water, 2 M NaOH, again with water until clear (4×)
6. dry with materialThe solution was dried over MgSO4
7. filtrationfiltered
8. customevaporated