Methanol → HCID 88069648, compound

Participants

Reaction Steps

Lithium hydroxide monohydrate (4.4 mg, 1.05 mml) was added to the compound of Example 16 (280 mg, 0.525 mmol) in a mixture of dioxane (10 ml) and water (10 ml). The mixture was heated at reflux for 2 h. The dioxane was removed in vacuo, the aqueous residue acidified with dilute HCl, the precipitate formed filtered off, washed with water and dried to give a brown solid. Trituration with hot methanol gave the title compound as a pale brown solid (94 mg). δH (DMSO-d6), 12.75 (1H,v br s,CO2H), 10.99 (1H, s, CONH), 9.75 (1H, s, CONH), 8.79 (2H, s, PyH), 8.44 (1H, dd, 14.8, 1.9 Hz, PyH), 7.68-7.64 (3H, m, ArH+PyH), 7.46 (1H, dd, J 7.5, 4.8 Hz, PyH), 7.38 (2H, d, J 8.6 Hz, ArH) and 2.33 (3H, s, Me); m/z (ESI, 70V) 505 (MH+).

Provenance & Evidence