[(R)-5-difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]carbamic acid tert-butyl ester → [(R)-5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a suspension of [(R)-5-difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (8 g, 19.23 mmol) in MeOH (56 mL) was added Pd(OH)2/C (20%, 50% water, 0.8 g). The atmosphere in the reactor was replaced by hydrogen (1 bar), then the reaction mixture was stirred at 20° C. for 5 h, filtered through Micro-crystals cellulose and concentrated. The crude product was recrystallized from MeOH and water to provide the title compound as a white solid: ESIMS: 360.1521; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 9.99 (s, 1H), 6.83 (dd, 1H), 6.74 (m, 1H), 6.50 (m, 1H), 6.22 (t, 1H), 4.95 (s, 2H), 4.46 (dd, 2H), 4.03 (m, 1H), 3.84 (m, 1H), 1.42 (s, 9H).

Provenance & Evidence