Acetyl chloride → (S)-1-Acetyl-5-biphenyl-4-ylmethyl-pyrrolidin-2-one

Participants

Reaction Conditions

Reaction Steps

(S)-5-biphenyl-4-ylmethylpyrrolidin-2-one (1-a, R1=H) (5 g, 19.9 mmol) is dissolved in THF (50 ml). The mixture is cooled to −78° C. and n-butyllithium (14 ml, 1.6 M) added. After 0.5 h, acetyl chloride (1.7 ml, 24 mmol) is added and the mixture is allowed to warm to room temperature. After 1 h, the mixture is quenched with saturated ammonium chloride (40 ml) and water (10 ml) and ethyl acetate (20 ml) are added. The organic phase is washed with brine, dried (MgSO4) and concentrated in vacuo to give (S)-1-Acetyl-5-biphenyl-4-ylmethyl-pyrrolidin-2-one (1-a, R1=Ac). 1H NMR (CDCl3): 1.84 (1H), 1.93 (1H), 2.30 (1H), 2.32 (1H), 2.50 (3H), 2.72 (1H), 3.09 (1H), 4.56 (1H), 7.20 (2H), 7.28 (1H), 7.37 (2H), 7.49 (4H).

Provenance & Evidence