Triethylamine → (4RS)-8-[(2R,3R,4R)-2-[(1R)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy]-3-phenyl-tetrahydropyran-4-yl]methyl-2-oxa-8-aza-spiro[4.5]decan-4-ol

Participants

Reaction Steps

Triethylamine (140 μL, 1.0 mmol) was added to a suspension of 2-oxa-8-aza-spiro[4.5]decan-4-ol hydrochloride (Description 8; 0.1 g, 0.54 mmol) in 1,2-dichloroethane (2 ml). After 10 minutes, (2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy]-3-phenyl-tetrahydropyran-4-carbaldehyde (see Example 43 in WO 00/56727; 0.24 g, 0.54 mmol) was added as a solution in 1,2-dichloroethane (3 ml). The mixture was stirred at room temperature for 30 minutes then sodium triacetoxyborohydride (0.2 g, 0.94 mmol) was added. The reaction was stirred at room temperature overnight. The mixture was partitioned between dichloromethane and brine. The organic layer was dried (MgSO4) and concentrated in vacuo. The residue was purified by preparative thin layer chromatography, eluting with 5% methanol/dichloromethane, to give the title compound (72 mg, 23%).

Provenance & Evidence