Pyruvic Acid → Mitoglitazone

Participants

Reaction Steps

A stirring solution of 5-(4-{[(2Z)-2-(5-ethylpyridin-2-yl)-2-(methoxyimino)ethyl]oxy}benzyl)-1,3-thiazolidine-2,4-dione (81 mg, 0.20 mmol; Supplier=Kalexsyn; Lot=1003-TTP-194) in 6M HCl (2 ml) and pyruvic acid (0.5 ml) was heated at 75° C. After 2 h at 75° C. HPLC showed reaction was complete. Neutralized with sat'd NaHCO3 and extracted with EtOAc. Extract dried (Na2SO4), filtered and evaporated in vacuo to give 45 mg (60%) pale yellow oil. 1H-NMR (DMSO-d6): δ12.02 (brs, 1H), 8.64 (s, 1H), 7.91 (m, 1H), 7.14 (d, J=8.5 Hz, 2H), 6.88 (d, J=8.5 Hz, 2H), 5.66 (s, 2H), 4.87 (dd, J=9.2, 4.3 Hz, 1H), 3.31 (m, 1H), 3.05 (dd, J=14.1, 9.1 Hz, 1H), 2.74 (q, J=7.7 Hz, 2H), 1.23 (t, J=7.7 Hz, 3H). HPLC (3.860 min., 100 area % @ 210 and 254 nm. MS (ESI—) for C19H18N2O4S m/z 371.3 (M+H)+: m/z 369.4 (M−H)−

Provenance & Evidence