反应详情

2′-(acetylamino)-N-(2,2-dimethyl-4-oxo-4H-1,3-benzodioxin-7-yl)-4′-methyl-4,5′-bi-1,3-thiazole-2-carboxamide (150 mg; 0.33 mmol; 1 eq.) is dissolved in THF (6 ml). Sodium hydroxide (0.82 ml; 5 M; 4.09 mmol; 12.50 eq.) is added and the mixture is stirred at rt for 10 days. Hydrogen chloride (0.82 ml; 5 M; 4.09 mmol; 12.50 eq.) is added and the solvents are evaporated. The resulting crude product is purified by preparative HPLC. To remove the TFA, the compound is dissolved in THF and an excess of POL-Trisamine (Argonault) is added. The solution is filtrated and evaporated, affording Compound (31)(54 mg; 39%). Potassium salt of 4-({[2′-(acetylamino)-4′-methyl-4,5′-bi-1,3-thiazol-2-yl]carbonyl}amino)-2-hydroxybenzoic acid, Compound (31), is prepared by dissolving the parent compound (54 mg, 0.129 mmol) in THF (2 ml) and water (2 ml). Potassium hydroxide 0.5N solution (258 μl, 1 eq) is added. The mixture is stirred 10 min at rt, filtered through cotton and is lyophilized. Potassium salt of compound (31) is isolated as a yellow solid (21.6 mg; 36%).

1. customthe solvents are evaporated
2. customThe resulting crude product is purified by preparative HPLC
3. customTo remove the TFA
4. dissolutionthe compound is dissolved in THF
5. additionan excess of POL-Trisamine (Argonault) is added
6. filtrationThe solution is filtrated
7. customevaporated