Trifluoroacetic acid → (S)-5-[(Biphenyl-4-yl)methyl]pyrrolidin-2-one

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Reaction Steps

8.9 g of (S)-5-biphenyl-4-ylmethyl-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester (1-a, R1=BOC) (25.3 mmol) is dissolved in 90 ml methylene chloride. Then 5 ml CF3COOH are added. This mixture is stirred at it for 1.5 h. The reaction mixture is concentrated. Heptane fraction is then added to the residue. The product is crystallized. The obtained product is dissolved in toluene and then it is washed with NaHCO3 (aq) solution. The organic layer is evaporated to yield (S)-5-biphenyl-4-ylmethylpyrrolidin-2-one [Key Lactam (1-a, R1=H)]. Spectroscopic data as in Example 3.

Provenance & Evidence