Sodium → 1,1-Dioxo-3-butyl-3-ethyl-5-phenyl-7-isopropoxy-8-carboxymethoxy-2,3,4,5-tetrahydro-1,5-benzothiazepine

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Reaction Conditions

Reaction Steps

To isopropyl alcohol (12 ml) was added sodium (115 mg, 5 mmol) and the temperature was then raised to 80° C. to let the alcohol salt form. After all the sodium was dissolved 1,1-dioxo-3-butyl-3-ethyl-5-phenyl-7-bromo-8-carboxymethoxy-2,3,4,5-tetrahydro-1,5-benzothiazepine (Method 9; 100 mg, 0.2 mmol) was added in one portion. The reaction was then refluxed overnight, and then cooled to room temperature and quenched with acetic acid. The solvent was then removed under reduced pressure and the residue was dissolved in water and MeCN (70/30) and partially purified by HPLC. The residue was dissolved in ethylene glycol and NaOH (500 mg) was added. This reaction mixture was heated to 125° C. overnight and then cooled to room temperature and quenched with acetic acid, and EtOAc (100 ml) was added. The ethylene glycol was removed by washing the organic layer with acidic water three times. The organic layer was then concentrated and the residue was purified again as above to give the title compound 40 mg (41%). NMR (300 MHz) 0.7–1.0 (m, 6H), 1.0–1.8 (m, 15H), 3.2 (q, 2H), 3.75 (m, 2H), 4.3 (m, 1H), 4.6 (s, 2H), 6.35 (s, 1H), 6.95–7.2 (m, 3H), 7.2–7.4 (m, 2H), 7.55 (s, 1H).

Provenance & Evidence