Hydrazine → (2S)-2-[(S)-[3,5-Bis(trifluoromethyl)phenyl](hydroxy)methyl]but-3-enehydrazide

Participants

Reaction Steps

(4S)-3-{(2S)-2-[(S)-[3,5-Bis(trifluoromethyl)phenyl](hydroxy)methyl]but-3-enoyl}-4-phenyl-1,3-oxazolidin-2-one (20 g, 42.5 mmol) and hydrazine (2.71 g, 85 mmol) in THF (100 mL) was stirred at room temperature for 1 hour. The reaction was diluted with ethyl acetate:hexanes (2:1, 200 mL) and was partitioned with water (100 mL). The organic was washed with brine (100 mL) and was dried over sodium sulfate, filtered, and concentrated. The crude product was triturated with IPA (30 mL) to remove the chiral auxiliary. The filtrate was concentrated to yield (2S)-2-[(S)-[3,5-bis(trifluoromethyl)phenyl](hydroxy)methyl]but-3-enehydrazide (14.5 g, 42.4 mmol), which was used without further purification. 1H NMR (500 MHz, CDCl3) δ7.81 (s, 3H), 7.83 (s, 1H), 7.0 (br s, 1H), 5.9 (m, 1H), 5.42 (d, J=3.3 Hz, 1H), 5.29 (d, J=10.3 Hz, 1H), 5.03 (d, J=17.1 Hz, 1H), 3.1 (dd, J=9.4, 3.5 Hz, 1H).

Provenance & Evidence