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0 °C

(R)-5-Biphenyl-4-ylmethyl-3-methylene-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester (4-a, R1=Boc) (509 mg) is dissolved in dichloromethane (10 ml). Mixture is cooled to 0° C. and trifluoroacetic acid (0.5 ml) is added. The mixture is then stirred for 2 h then extracted with saturated sodium carbonate solution (20 ml). Phases are separated. The organic phase is dried (MgSO4) and concentrated to give (R)-5-biphenyl-4-ylmethyl-3-methylenepyrrolidin-2-one (4-a, R1=H). δH (400 MHz, DMSO) 2.47 (1H), 2.68 (1H), 2.74 (1H), 2.87 (1H), 3.87 (1H), 5.22 (1H), 5.64 (1H), 7.33 (3H), 7.45 (2H), 7.60 (2H), 7.65 (2H), 8.32 (1H); m/z (+) 264 ([MH]+, 100%); m/z (+ESI) 264 ([MH]+, 100%).

1. extractionthen extracted with saturated sodium carbonate solution (20 ml)
2. customPhases are separated
3. dry with materialThe organic phase is dried (MgSO4)
4. concentrationconcentrated