Potassium Carbonate → [(3-{[4-(Methyloxy)phenyl]methyl}-2-oxo-7-{[(phenylmethyl)oxy]methyl}-1-oxa-3-azaspiro[4.5]dec-7-ylmethyl]amino)-4-nitrobenzonitrile

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To a light yellow solution of 7-(aminomethyl)-7-((benzyloxy)methyl)-3-(4-methoxybenzyl)-1-oxa-3-azaspiro[4.5]decan-2-one (4.27 g, 10.1 mmol) in acetonitrile (67.1 mL) was added potassium carbonate (2.78 g, 20.1 mmol) and 3-fluoro-4-nitrobenzonitrile (2.51 g, 15.1 mmol) and the reaction was stirred at RT. After stirring 15 h, the reaction was filtered through a frit. The collected inorganics were washed with DCM/EtOAc. The filtrate was concentrated onto florisil and purified on a 80 g silica gel column (20-55% EtOAc/hexanes, 30 min gradient; 55% EtOAc/hexanes, 5 min.; 60 mL/min elution; 254 nm detection) to provide 3-{[(3-{[4-(methyloxy)phenyl]methyl}-2-oxo-7-{[(phenylmethyl)oxy]methyl}-1-oxa-3-azaspiro[4.5]dec-7-ylmethyl]amino)-4-nitrobenzonitrile (5.02 g, 83% yield) as a reddish-orange oil. MS (m/z) 571.0 (M+H+).

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