Methyl Benzoate → HCID 131733077, compound

Participants

Reaction Steps

Under N2, the mixture of (S)-5-biphenyl-4-ylmethyl-1-pyrrolidin-1-ylmethylpyrrolidin-2-one (3a, R1=pyrrolidinylmethyl) (6.68 g, 20 mmol) and benzoic acid methyl ester (3.0 g, 22 mmol) in 20 mL toluene is heated to reflux, sodium hydride (55% in mineral oil, 1.14 g, 26 mmol) is added, and stirred overnight at reflux. The reaction mixture is diluted with 20 mL saturated aqueous ammonium chloride solution and stirred for 15 min, stop stirring, and remove the lower aqueous layer. the organic phase is concentrated to dryness, the residue was purified by column chromatography (ethyl acetate/heptane=1/1) to give (R/S)-3-Benzoyl-(R)-5-biphenyl-4-ylmethyl-1-pyrrolidin-1-ylmethyl-pyrrolidin-2-one (4a, R1=pyrrolidinylmethyl, R4=phenyl), the ratio of (3S,5R) and (3R,5R) is 60:40 as determined by HPLC. 1HNMR (400 MHz, CDCl3): 1.68 (m, 4H, 2×CH2CH2), 1.98 (m, 1H, 3-CHH), 2.23 (m, 1H, 3-CHH), 2.51 (m, 4H, 2×NCH2), 2.65 (dd, 1H, N—CHH), 3.15 (dd, 1H, N—CHH), 2.67 (d, 1H, 5-CHH), 2.92 (d, 1H, 5-CHH), 3.73 (m, 1H, 2-CH), 3.78 (m, 1H, 4-CH), 7.20-8.00 (14H, m, aromatic).

Provenance & Evidence