反应详情

To a stirred solution of (2,2-diphenylethyl)methylamine (4.97 g, 23.5 mmol) in chloroform (50 mL) was added O-acetylmandelic chloride (5.3 mL, 24 mmol) followed by triethylamine (4.0 mL, 29 mmol). The reaction was stirred for 1 hour and then concentrated. The residue was partitioned between ethyl acetate and aqueous sodium bicarbonate solution. The organic layer was dried (sodium sulfate) and concentrated to afford a colorless gum. The crude amide was taken up in 1:1 tetrahydrofuran/methanol (80 mL) and treated with 1 N aqueous lithium hydroxide (30 mL, 30 mmol). The mixture was stirred for 2 hours and concentrated to remove the organic solvents. The remaining aqueous solution was diluted with water and extracted twice with ethyl acetate and once with methylene chloride. The combined organic extracts were dried (sodium sulfate) and concentrated to afford an off-white solid. This material was triturated with diethyl ether to afford 7.59 g (93%) of product as a white solid: 1H NMR (CDCl3) δ 7.43-6.98 (m, 15H), 5.07 (s, 1H), 4.57-4.44 (m, 1H), 4.36-4.28 (m, 1H), 3.76-3.64 (m, 1H), 2.46 (s, 3H) ppm.

1. concentrationconcentrated
2. customThe residue was partitioned between ethyl acetate and aqueous sodium bicarbonate solution
3. dry with materialThe organic layer was dried (sodium sulfate)
4. concentrationconcentrated
5. customto afford a colorless gum
6. stirringThe mixture was stirred for 2 hours
7. concentrationconcentrated
8. customto remove the organic solvents
9. additionThe remaining aqueous solution was diluted with water
10. extractionextracted twice with ethyl acetate and once with methylene chloride
11. dry with materialThe combined organic extracts were dried (sodium sulfate)
12. concentrationconcentrated
13. customto afford an off-white solid
14. customThis material was triturated with diethyl ether