反应详情

(2R,4R)-4-(tert-Butyl-dimethyl-silanyloxy)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (4.45 g, 12.9 mmol) was dissolved in 50 mL dry CHCl3 under an Ar atmosphere, added 4-bromo-2-fluoroaniline (2.45 g, 12.9 mmol), EEDQ (3.8 g, 15 mmol), and triethylamine (2.6 mL, 19.3 mmol). Reaction was refluxed for 6 hours, cooled and concentrated. Redissolved in EtOAc (250 mL), washed with 10% HCl (2×200 mL), 0.1M NaOH (2×200 mL), water, brine, dried with MgSO4, filtered and concentrated to yield title compound. (5.5 g, 82%) APCI (AP−): 515.1, 517.1 (M−H)−. Step 4: (2R,4R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(3-fluoro-2′-methylsulfanyl-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

1. customReaction
2. temperaturewas refluxed for 6 hours
3. temperaturecooled
4. concentrationconcentrated
5. dissolutionRedissolved in EtOAc (250 mL)
6. washwashed with 10% HCl (2×200 mL), 0.1M NaOH (2×200 mL), water, brine
7. dry with materialdried with MgSO4
8. filtrationfiltered
9. concentrationconcentrated