Ethyl bromoacetate → HCID 18442453, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 1,1-dioxo-3,3-dipropyl-5-phenyl-7-methylthio-8-hydroxy-2,3,4,5-tetrahydro-1,5-benzothiazepine (Method 117; 0.665 g, 1.58 mmol) in MeCN (10 ml) was added ethyl bromoacetate (0.262 ml, 2.35 mmol), tetrabutylammonium bromide (0.051 g, 0.158 mmol) and sodium carbonate (0.870 g, 8.21 mmol). The mixture was stirred over night at 80° C. The solvent was removed under reduced pressure and the residue was partitioned between EtOAc and 0.5 M HCl. The organic layer was washed with brine, dried (MgSO4) and concentrated. The residue was filtered through a short silica column (DCM:EtOAc-9:1), concentrated and dissolved in EtOH (10 ml). A solution of NaOH (0.25 g, 6.25 mmol) in water (1 ml) was added and the solution was stirred over night at room temperature. The solvent was removed under reduced pressure and the residue was partitioned between EtOAc and 0.5 M HCl. The aqueous layer was extracted twice more with EtOAc and the combined organic extracts were washed with brine and concentrated. The crude product was purified by preparative HPLC using a MeCN/ammonium acetate buffer to give the title compound in 0.441 g (58%) as a white solid. NMR (DMSO-d6) 0.55–0.75 (m; 6H), 1.05–1.50 (m, 8H), 2.15 (s, 3H), 3.20 (s, 2H), 3.65 (brs, 2H), 4.50 (s, 2H), 6.65 (s, 1H), 6.80–7.00 (m, 3H), 7.15 (s, 1H), 7.15–7.25 (m, 2H).

Provenance & Evidence