Methanol → {4-[(R)-2-((E)-3-hydroxy-4-phenyl-but-1-enyl)-6-oxo-piperidin-1-yl]-but-2-ynyloxy}-acetic acid methyl ester

Participants

Reaction Steps

Sodium borohydride (24 mg, 0.63 mmol) followed by MeOH (1 mL) was added to a solution of {4-[(R)-2-oxo-6-((E)-3-oxo-4-phenyl-but-1-enyl)-piperidin-1-yl]-but-2-ynyloxy}-acetic acid methyl ester (82 mg, 0.21 mmol) in CH2Cl2 (2 mL) at 0° C. After 5 min at 0° C. the reaction was quenched with aqueous HCl (0.2 M, 10 mL). The reaction mixture was extracted with CH2Cl2 (3×10 mL), then the combined extracts were dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (CH2Cl2→3% MeOH/CH2Cl2) afforded 56.5 mg (69%) of {4-[(R)-2-((E)-3-hydroxy-4-phenyl-but-1-enyl)-6-oxo-piperidin-1-yl]-but-2-ynyloxy}-acetic acid methyl ester and 11 mg (14%) of (R)-1-[4-(2-hydroxy-ethoxy)-but-2-ynyl]-6-((E)-3-hydroxy-4-phenyl-but-1-enyl)-piperidin-2-one.

Provenance & Evidence