N-(tert-butoxycarbonyl)glycine → {2-[(S)-2-Benzyl-4-(3-cyclopentyloxy-4-methoxy-phenyl)-piperazin-1-yl]-2-oxo-ethyl}-carbamic acid tert-butyl ester

Participants

Reaction Steps

A solution of (S)-3-Benzyl-1-(3-cyclopentyloxy-4-methoxy-phenyl)-piperazine (73 mg, 0.2 mmol) and BOC-glycine (35 mg, 0.2 mmol) in DMF (1.0 mL) at room temperature was treated with diisopropylethylamine (35 μL, 0.2 mmol) followed by 2-(7-Aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) (84 mg, 0.22 mmol). The reaction mixture was stirred for 2 h then partitioned between EtOAc (10 mL) and a saturated aqueous NaHCO3 solution (10 mL). The organic component was isolated and further washed with brine (10 mL) then dried over MgSO4, filtered, and evaporated to an oil which was purified by silica gel flash chromatography with 40% EtOAc/hexane as eluant to afford intermediate {2-[(S)-2-Benzyl-4-(3-cyclopentyloxy-4-methoxy-phenyl)-piperazin-1-yl]-2-oxo-ethyl}-carbamic acid tert-butyl ester as a foam (85 mg, 81%). LC/MS 7.46 min, [M+1]+ 524.

Provenance & Evidence