Sodium Hydroxide → 2-[7-Benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-9-thia-1,7-diaza-fluoren-3-yl]pentanoic acid

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Reaction Steps

To a suspension of ethyl [7-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-9-thia-1,7-diaza-fluoren-3-yl]pentanoate (0.514 g; 1 mmol) in a mixture methanol-ethanol (2:1) (15 mL) was added a 5% sodium hydroxide solution (15 mmol; 12 mL) and the reaction mixture was heated at reflux for 18 h. After cooling, the organic volatiles were removed under reduced pressure and the remaining basic solution was acidified with HCl (1N) until pH 2 and the aqueous layer was extracted with ethyl acetate. The organics were combined, dried over magnesium sulphate and concentrated under reduced pressure. Purification by preparative HPLC (HPLC method 2) furnished 0.027 g (5.5%) of the title compound as a light yellow solid.

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