Sulfuric Acid → (2R,4S)-ethyl 5-([1,1'-biphenyl]-4-yl)-4-aMino-2-Methylpentanoate

Participants

Reaction Steps

1 g (3R,5S)-5-biphenyl-4-ylmethyl-3-methylpyrrolidin-2-one (2-a, R1=H), 10 ml ethanol and 0.4 ml concentrated sulphuric acid were heated at about 80-120° C. for about 24 hours. The mixture was evaporated to dryness to obtain (2R,4S)-4-amino-5-biphenyl-4-yl-2-methylpentanoic acid ethyl ester (hydrogen sulphate salt). Spectroscopic data as in Example 44.

Provenance & Evidence