Cesium carbonate → 5-Cyano-3-methyl-pyridine-2-carboxylic acid [6-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-fluoro-pyridin-2-yl]-amide

Participants

Reaction Conditions

Reaction Steps

A mixture of (2R,5R)-5-(6-bromo-3-fluoro-pyridin-2-yl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (80 mg, 0.216 mmol), 5-cyano-3-methyl-pyridine-2-carboxylic acid amide (34.8 mg, 0.216 mmol, see Intermediates Amide 1), xantphos (11.26 mg, 0.019 mmol) and cesium carbonate (99 mg, 0.303 mmol) in dioxane (2 ml) was degassed for 5 minutes with argon. Pd2(dba)3 (5.94 mg, 6.48 μmol) was added, the microwave vial was sealed and stirred at 80° C. for 18 hours. The reaction mixture was diluted with water and TBME. The organic phase was washed with brine, dried over sodium sulfate, filtered and evaporated. 173 mg orange solid. Silica gel chromatography (applied on two 20×20 cm plate, 1 mm, dichloromethane:methanol 9:1, rechromatographed with dichloromethane:methanol 95:5 with double evolution of the plates) afforded the titel compound: 15 mg and 21 mg. Combined amount: 36 mg (37% yield). TLC (dichloromethane/methanol 9:1) Rf=0.53; API ES+ MS 451. LCMS RtH4=0.87 min. (100%, ES+ 451), 1H-NMR (400 MHz, CDCl3): 10.80 (br s, 1H), 8.83 (br s, 1H), 8.41 (dd, 1H), 7.93 (br s, 1H), 7.55 (t, 1H), 5.8-4.6 (very broad, 2H), 4.23 (br s, 2H), 2.83 (s, 3H), 1.75 (s, 3H), 1.66 (s, 3H).

Provenance & Evidence