反应详情

温度

0 °C

To a cooled (0° C.) and stirred suspension of 5-(tetradecyloxy)furan-2-carboxylic acid (0.324 g, 1 mmol) in 10 mL of CH2Cl2 was added oxalyl chloride (0.135 mL, 1.5 mmol) and 2 drops of N,N-dimethylformamide. Immediate effervescence was observed. The solution was allowed to warm to room temperature with continued stirring until such a time that gas evolution had ceased and all suspended solids had dissolved. The solution was then cooled to 0° C. once more and salicylic acid (0.180 g, 1.3 mmol) and Et3N (3 mL) were added to the rapidly stirred reaction. After stirring for 2 hrs, the reaction was diluted with EtOAc (100 mL) and the organic phase was washed with 1M HCl (2×100 mL) and brine (100 mL) and then dried and concentrated to give a white solid residue. The crude material was purified by flash chromatography eluting with 5-40% EtOAc in Hexanes with 1% AcOH. The resulting material was further purified by recrystallization from CH2Cl2 and hexanes to yield 0.225 g (57%) of the title compound as a white crystalline material. 1H NMR (300 MHz, CDCl3) δ: 8.08 (dd, 1H), 7.62 (dt, 1H), 7.32-7.38 (m, 2H), 7.24 (dd, 1H), 5.39 (d, 1H), 4.18 (t, 2H), 1.80 (p, 2H), 1.2-1.5 (m, 22H), 0.88 (t, 3H).

1. temperatureto warm to room temperature
2. stirringwith continued stirring until such a time that gas evolution
3. dissolutionall suspended solids had dissolved
4. temperatureThe solution was then cooled to 0° C. once more
5. stirringAfter stirring for 2 hrs
6. washthe organic phase was washed with 1M HCl (2×100 mL) and brine (100 mL)
7. customdried
8. concentrationconcentrated
9. customto give a white solid residue
10. customThe crude material was purified by flash chromatography
11. washeluting with 5-40% EtOAc in Hexanes with 1% AcOH
12. customThe resulting material was further purified by recrystallization from CH2Cl2 and hexanes