Dimethylformamide → N-[(4aR,6R,8aS)-8a-(5-cyano-2-fluorophenyl)-6-(3-methyl-1,2-oxazol-5-yl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]benzamide

Participants

Reaction Conditions

Reaction Steps

N-[(4aR,6R,8aS)-8a-(5-Bromo-2-fluorophenyl)-6-(3-methyl-1,2-oxazol-5-yl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]benzamide (C36) (0.100 g, 0.189 mmol), zinc cyanide (0.027 g, 0.227 mmol), tetrakis(triphenylphosphine)palladium(0) (0.127 g, 0.110 mmol) and N,N-dimethylformamide (6 mL) were added to an Emrys microwave reaction vial. The vial was sealed and purged with nitrogen gas for 10 minutes with stirring. After that time, the vial was placed on a Biotage microwave processor and heated to 80° C. for 3 hours. The reaction mixture was partitioned between ethyl acetate (100 mL) and a saturated aqueous solution of sodium bicarbonate (100 mL). The layers were separated and aqueous layer was extracted further with ethyl acetate (3×50 mL). The combined organics were washed with brine (200 mL), dried over sodium sulfate, filtered and concentrated in vacuo. Purification via silica gel chromatography (Gradient: 30% to 100% ethyl acetate in heptane) afforded the product as an off-white solid. Yield: 51 mg, 57%. LCMS m/z 477.3 [M+H+]. 1H NMR (400 MHz, CD3OD) characteristic peaks: δ 8.09 (br s, 2H), 7.83-7.87 (m, 2H), 7.40-7.59 (m, 4H), 4.97 (d, J=9.2 Hz, 1H), 4.30 (dd, J=11.7, 1.6 Hz, 1H), 4.00-4.13 (m, 2H), 2.97 (dd, J=12.9, 3.9 Hz, 1H), 2.82 (dd, J=13.2, 3.0 Hz, 1H).

Provenance & Evidence