Ammonium formate → rel-(3S,4S)-4-((S)-1-amino-1-(2-fluorophenyl)ethyl)tetrahydrofuran-3-ol

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Reaction Steps

A solution of (3S,3aS,6aS)-rel-3-(2-fluoro-phenyl)-3-methyl-hexahydro-furo[3,4-d]isoxazole (16.72 g, 72.9 mmol) in ethanol (300 ml) was treated with ammonium formate (36.8 g, 583 mmol) and palladium (5% on carbon; 7.76 g). The reaction mixture was stirred at room temperature for 18 hours, then filtered and the filtrate evaporated at reduced pressure. The crude product was triturated with diisopropyl ether (50 ml) and filtered. The filtrate was evaporated at reduced pressure and the (3S,4S)-4-[(S)-rel-1-amino-1-(2-fluoro-phenyl)-ethyl]-tetrahydro-furan-3-ol (8.69 g, 48% yield) was obtained as a thick colorless oil. MS (ISP): m/z=226.2 [M+H]+. The solid material obtained after filtration, the rel-(3S,4S)-4-[(S)-1-amino-1-(2-fluoro-phenyl)-ethyl]-tetrahydro-furan-3-ol formate (8.21 g, 42% yield), was treated with a saturated solution of sodium hydrogencarbonate (100 ml) and with dichloromethane (100 ml) and stirred for 1 hour. The aqueous layer was separated and extracted with dichloromethane, then the combined organic layers were dried over sodium sulphate and evaporated. An additional amount of the rel-(3S,4S)-4-[(S)-1-amino-1-(2-fluoro-phenyl)-ethyl]-tetrahydro-furan-3-ol (5.6 g, 31% yield) was obtained as a thick colorless oil. MS (ISP): m/z=226.2 [M+H]+.

Provenance & Evidence