反应详情

温度

10 °C

Pyridine (149 g, 1.89 mol) was added to a solution of (2S,3S)-2-acetoxy-3-(3-acetoxy-2-methyl-benzoylamino)-4-phenyl-butyric acid (193 g, 468 mmol) and acetonitrile (1.6 L) at ambient temperature, and the mixture was then cooled to 10° C. A solution of SOCl2 (62.3 g, 523 mmol) and acetonitrile (50 mL) was added over 15 min., and cooling was then discontinued. 15 minutes later, additional SOCl2 (0.80 g, 6.7 mmol) was added. After stirring at ambient temperature for 25 min., the mixture was cooled to 10° C. (2S)-4,4-Difluoro-3,3-dimethyl-pyrrolidine-2-carboxylic acid (2,2,2-trifluoro-ethyl)-amide; hydrochloride (139 g, 468 mmol) was added in portions over 15 min. The mixture was warmed to ambient temperature for 1 h, and was then cooled to 10° C. A 5° C. solution of KOH (85% assay; 186 g, 2.82 mol) and methanol (1.1 L) was then added over 10 min, followed by addition of K2CO3 (51.8 g, 375 mmol). The mixture was warmed to ambient temperature for 1 h, and was then concentrated to a weight of 1.5 kg using a rotary evaporator. The resulting mixture was partitioned between 0.5 N HCl (1.6 L) and ethyl acetate (1.4 L), and the layers were separated. The organic fraction was sequentially washed with saturated aqueous NaHCO3 (1.4 L), 0.5 N HCl (1.6 L), and then H2O (1.4 L). The organic fraction was concentrated to a wet solid using a rotary evaporator, and was then further dried in a vacuum oven at 50° C. for 24 h. The resulting solid was dissolved in absolute ethanol (800 mL), and was then concentrated on a rotary evaporator. The resulting solid was once again dissolved in ethanol (600 mL), then concentrated on a rotary evaporator, and then dried in a vacuum oven at 50° C. for 24 h. The solid was dissolved in ethanol and 0.11 N HCl (620 mL) was then slowly added. H2O (950 mL) was slowly added and the resulting suspension of crystals was stirred overnight. The solid was filtered, washed with ethanol/H2O (1:3, 200 mL), and dried in a vacuum oven at 55° C. to provide 259 g (96.9%) of (2S)-4,4-difluoro-1-[(2S,3S)-2-hydroxy-3-(3-hydroxy-2-methyl-benzoylamino)-4-phenyl-butyryl]-3,3-dimethyl-pyrrolidine-2-carboxylic acid (2,2,2-trifluoro-ethyl)-amide as a white crystalline solid: 1H NMR (300 MHz, DMSO-d6) displayed a ˜20:1 mixture of rotamers. Major rotamer resonances δ 9.34 (s, 1H), 8.66 (app t, J=6.3 Hz, 1H), 8.13 (d, J=8.3 Hz, 1H), 7.15–7.35 (m, 5H), 6.96 (app t, J=7.7 Hz, 1H), 6.79 (d, J=7.3 Hz, 1H), 6.55 (d, J=6.7 Hz, 1H), 5.56 (d, J=6.4 Hz, 1H), 4.26–4.54 (m, 5H), 3.81–4.07 (m, 2H), 2.86–2.90 (m, 1H), 2.71 (app dd, J=10.5, 13.6 Hz, 1H), 1.82 (s, 3H), 1.22 (s, 3H), 1.04 (s, 3H) [characteristic minor rotamer resonances δ 8.62 (5, J=6.5 Hz), 5.35 (d, J=7.6 Hz), 1.86 (s)]; 13C NMR (75 MHz, DMSO-d6) displayed a ˜20:1 mixture of rotamers. Major rotamer resonances δ 171.5, 169.6, 168.6, 155.7, 139.6, 139.4, 129.8, 128.2, 127.9 (dd, JCF=251.7, 253.5 Hz), 126.2, 126.0, 125.0 (q, JCF=279.2 Hz), 121.8, 117.9, 115.6, 73.2, 68.3, 53.0, 51.4 (t, JCF=32.6 Hz), 43.8 (t, JCF=20.8 Hz), 34.5, 22.4 (d, JCF=4.1 Hz), 16.9 (d, JCF=7.3 Hz), 12.5 [characteristic minor rotamer resonances δ 171.7, 139.1, 129.5, 68.7, 47.0 (t), 16.5 (d)]; MS (CI) m/z 572.2189 (527.2184 calcd for C27H31N3O5F5, M+H+).

1. temperaturecooling
2. temperatureThe mixture was warmed to ambient temperature for 1 h
3. temperaturewas then cooled to 10° C
4. temperatureThe mixture was warmed to ambient temperature for 1 h
5. concentrationwas then concentrated to a weight of 1.5 kg
6. customa rotary evaporator
7. customThe resulting mixture was partitioned between 0.5 N HCl (1.6 L) and ethyl acetate (1.4 L)
8. customthe layers were separated
9. washThe organic fraction was sequentially washed with saturated aqueous NaHCO3 (1.4 L), 0.5 N HCl (1.6 L)
10. concentrationThe organic fraction was concentrated to a wet solid
11. customa rotary evaporator
12. customwas then further dried in a vacuum oven at 50° C. for 24 h
13. dissolutionThe resulting solid was dissolved in absolute ethanol (800 mL)
14. concentrationwas then concentrated on a rotary evaporator
15. dissolutionThe resulting solid was once again dissolved in ethanol (600 mL)
16. concentrationconcentrated on a rotary evaporator
17. customdried in a vacuum oven at 50° C. for 24 h
18. dissolutionThe solid was dissolved in ethanol
19. addition0.11 N HCl (620 mL) was then slowly added
20. additionH2O (950 mL) was slowly added
21. additionthe resulting suspension of crystals
22. stirringwas stirred overnight
23. filtrationThe solid was filtered
24. washwashed with ethanol/H2O (1:3, 200 mL)
25. customdried in a vacuum oven at 55° C.