Sodium triacetoxyborohydride → 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-1-((S)-1-(methyl(oxetan-3-yl)amino)butan-2-yl)-2-oxopiperidin-3-yl)acetic acid

Participants

Reaction Steps

To a solution of oxetan-3-one (17.78 mg, 0.247 mmol) in DCE (3 mL) was added 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-1-((S)-1-(methylamino)butan-2-yl)-2-oxopiperidin-3-yl)acetic acid ammonium salt (61 mg, 0.123 mmol) obtained in Step A followed by sodium triacetoxyborohydride (78 mg, 0.370 mmol) and 3 drops AcOH. After 45 minutes, 3 ml MeOH and oxetan-3-one (12 mg, 0.17 mmol) were added. After stirring overnight, oxetan-3-one (12 mg, 0.17 mol) and sodium triacetoxyborohydride (60 mg, 0.32 mmol) were added. After 24 hours, the mixture was diluted with methanol and evaporated onto silica gel. The solid was purified by flash chromatography on silica gel (eluent: 0 to 100% [6:1:0.1 DCM/MeOH/NH4OH] in DCM). The product containing fractions were pooled, concentrated and repurified by preparative thin layer chromatography on silica gel (eluent: 10% MeOH/DCM) to afford the title compound.

Provenance & Evidence