Acetic Acid → 3-amino-N-methyl-6-(4-oxocyclohexyl)pyridine-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-Amino-6-(1,4-dioxaspiro[4.5]dec-8-yl)-N-methylpyridine-2-carboxamide (Compound 232C, 0.160 g, 0.549 mmol) in AcOH (1.0 mL, 18 mmol) and H2O (0.2 mL, 10 mmol) was warmed to 75° C. for 2.5 hours, after which, the reaction was cooled and concentrated in vacuo. The residue was taken up in water and basified with a saturated aqueous solution of K2CO3. This mixture was extracted three times with DCM and the combined organic layers were dried over Na2SO4, filtered and concentrated to a brown tar. This was taken up in DCM, treated with silica and concentrated and loaded into a sample cartridge. The product was isolated after purification on an ISCO Combiflash unit (eluting with 0-4% MeOH/DCM) as 53 mg of a white crystalline solid. 1H NMR (400 MHz, DMSO-d6) δ 1.97-2.13 (m, 4H), 2.26 (dt, J=14.40, 2.02 Hz, 2H), 2.52-2.59 (m, 2H), 2.77 (d, J=5.05 Hz, 3H), 3.05 (tdd, J=11.43, 3.79, 3.66 Hz, 1H), 6.65 (s, 2H), 7.09 (d, J=8.30 Hz, 1H), 7.20 (d, J=8.30 Hz, 1H), 8.42 (d, J=4.80 Hz, 1H). MS (ES+): m/z=247.87 (90) [M+1]. HPLC: tR=2.95 min (ZQ3, polar—5 min).

Provenance & Evidence