Ammonia → (3S,4S)-3-(tert-Butoxycarbonyl)amino-4-vinylpyrrolidine

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Reaction Steps

A solution of (3S,4S)-1-benzyloxycarbonyl-3-(tert-butoxycarbonyl)amino-4-vinylpyrrolidine (275 mg, 0.794 mmol) in tetrahydrofuran (5 mL) and sodium (300 mg, 13.0 mmol) were sequentially added to liquid ammonia (80 mL) at −78° C., and the mixture was stirred at the same temperature for 0.5 hours. The solvent was removed, followed by dilution with chloroform (80 mL). The resultant mixture was washed sequentially by 1 mol/L sodium hydroxide (30 mL) and saturated brine (100 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure, to thereby yield the title compound as a colorless oily substance (168 mg, 100%).

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