Diisopropylethylamine → ((2R,5R)-5-{5-[(5-Bromo-pyrimidine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-di-methyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester

Participants

Reaction Steps

To a solution of [(2R,5R)-5-(5-amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (76 mg, 0.187 mmol) in DMF (2 ml) was added 5-bromopyridine-2-carboxylic acid (47 mg, 0.225 mmol), EDC.HCl (48 mg, 0.244 mmol), HOAt (29 mg, 0.206 mmol) and DIPEA (0.08 ml, 0.469 mmol) and the reaction mixture was kept at 25° C. for 16 h. The mixture was concentrated, the residue dissolved in EtOAc and washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and purified by chromatography on silica gel (hexane-EtOAc 20:1 to 1:1) to provide the title compound as a light yellow foam: HPLC RtH5=1.297 min); ESIMS: 590, 592 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 10.98 (br s, 1H), 9.71 (br s, 1H), 8.94 (s, 2H), 7.89 (m, 1H), 7.49 (dd, 1H), 7.12 (dd, 1H), 4.38 (d, 1H), 4.04 (d, 1H), 1.66 (s, 3H), 1.56 (s, 3H), 1.52 (s, 9H).

Provenance & Evidence