Triethylamine → 4-(dimethylamino)-N-[(1R,4S,5S,7R)-5-(3-hydroxyphenyl)-4-methyl-2-(3-phenylpropyl)-2-azabicyclo[3.3.1]non-7-yl]butanamide

Participants

Reaction Steps

BOP reagent (27 mg, 0.060 mmol) was added to a solution of (+)-7-amino-4-methyl-5-(3 -hydroxyphenyl)-2-(3-phenylpropyl)-2-azabicyclo[3.3.1]nonane (23, 20 mg, 0.055 mmol), 4-(dimethylamino)butyric acid hydrochloride (18 mg, 0.11 mmol) and triethylamine (0.038 mL, 0.27 mmol) in dry THF (5 mL). The reaction mixture was stirred under N2 at room temperature for 4 h. The mixture was diluted with Et2O (20 mL), washed with saturated NaHCO3, followed by water, organic layer collected, dried (Na2SO4) and solvent removed under reduced pressure yielding crude product. This was purified by flash chromatography (33% (80% CHCl3:18% CH3OH:2% NH4OH) in CHCl3) to afford 4-(dimethylamino)-N-[(1R,4S,5S,7R)-5-(3-hydroxyphenyl)-4-methyl-2-(3-phenylpropyl)-2-azabicyclo[3.3.1]non-7-yl]butanamide (13) (23 mg, 89%) as an off-white foam. 1H-NMR (CDCl3) δ7.28-7.09 (m, 6H), 6.89 (d, 1H, J=7.0 Hz), 6.64-6.59 (m, 3H), 6.31 (m, 1H), 4.65 (br., 1H), 3.16 (br., 1H), 3.02 (d, 1H, J=7.8 Hz), 2.69-2.14 (m, 16H), 1.91 (m, 1H), 1.86-1.75 (m, 4H), 1.58 (m 1H), 1.36-0.83 (m, 3H), 0.71 (d, 3H, J=6.5 Hz); LRMS (ES) m/z 478.7 (M+H)+.

Provenance & Evidence