Ammonium Chloride → (+/-)-(4R*,5R*)-5-((1S *)-Hydroxy-2-thienylmethyl)-1-methyl4-phenyl-pyrrolidin-2-one

Participants

Reaction Conditions

Reaction Steps

To a −50° C. solution of lithium thiophene (1M in THF, 170 mL, 170 mmol) was added a solution of (±)-(4R*,5R*)-5-formyl-1-methyl-4-phenylpyrrolidin-2-one (Intermediate Z, 127 mmol) in THF (10 mL). The reaction mixture was allowed to warm to 0° C. over 45 min and treated with a saturated NH4Cl solution. The resulting mixture was extracted with EtOAc, dried (MgSO4) and concentrated under reduced pressure. The crude product was purified by flash chromatography (67% EtOAc/hex) to give (±)-(4R*,5R*)-5-((1S*)-hydroxy-2-thienylmethyl)-1-methyl-4-phenylpyrrolidin-2-one (9.76 g, 27%): TLC (EtOAc) Rf 0.42.

Provenance & Evidence