Potassium Hydroxide → HCID 59263269, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-[6-hydroxy-7-(1,1,4-trioxo-[1,2,5]thiadiazolidin-2-yl)-naphthalen-2-yl]-pentanoic acid ethyl ester (Example 8, 0.025 g, 0.053 mmol) in MeOH/H2O (3 mL) is added KOH (0.009 g, 0.159 mmol). This is stirred at 50° C. for 18 h. LC/MS reveals the desired product, so the reaction solution is acidified using 1 N HCl, extracted with EtOAc. The organic layer is washed with brine, dried over MgSO4, filtered, and concentrated in vacuo to afford 5-[6-hydroxy-7-(1,1,4-trioxo-1,2,5-thiadiazolidin-2-yl)-naphthalen-2-yl]-pentanoic acid as a white solid: 1H NMR (MeOD) δ7.88 (s, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.54 (s, 1H), 7.31 (dd, J=8.46, 1.64 Hz, 1H), 7.21 (s, 1H), 4.61 (s, 2H), 2.75 (t, J=7.33 Hz, 2H), 2.32 (t, J=7.07 Hz, 2H), 1.61 (m, 4H). Retention time=0.87 min (Method A); (M−H)−=377.

Provenance & Evidence