反应详情

Thionyl chloride (6 mL) was added over 1 min to a 0° C. solution of 2-iodo-3-methyl benzoic acid (3.0 g, 11.4 mmol) in DCM (10 mL). The solution was stirred for 24 h at rt and the volatile components were removed in vacuo. A portion of the crude acid chloride (955 mg) was dissolved in THF (15 mL) and NaBH4 (380 mg, 10 mmol) was added. After stirring for 90 min, multiple spots were evident by TLC analysis. The reaction mixture was cooled to −78° C. and solid LiAlH4 (300 mg, 7.91 mmol) was added. The reaction was stirred for 30 min, after which TLC analysis showed one major spot. The reaction was quenched by addition of EtOAc (10 mL) and was slowly poured into a vigorously stirred solution of HCl (1M, 30 mL). EtOAc (70 mL) was added, the layers were separated, and the organic layer was washed with NaHCO3 (3×15 mL), water (15 mL), brine (40 mL), and was dried over sodium sulfate. Removal of the solvent in vacuo yielded the title compound (752 mg, 89%) as a thick oil which was used without further purification. 1H-NMR (CDCl3): δ 7.27 (m, 2H), 7.20 (m, 2H), 4.74 (m, 2H), 2.50 (s, 3H), 2.0 (br s, 1H).

1. customthe volatile components were removed in vacuo
2. dissolutionA portion of the crude acid chloride (955 mg) was dissolved in THF (15 mL)
3. stirringAfter stirring for 90 min
4. temperatureThe reaction mixture was cooled to −78° C.
5. stirringThe reaction was stirred for 30 min
6. customThe reaction was quenched by addition of EtOAc (10 mL)
7. additionwas slowly poured into a vigorously stirred solution of HCl (1M, 30 mL)
8. additionEtOAc (70 mL) was added
9. customthe layers were separated
10. washthe organic layer was washed with NaHCO3 (3×15 mL), water (15 mL), brine (40 mL)
11. dry with materialwas dried over sodium sulfate
12. customRemoval of the solvent in vacuo