Sodium Carbonate → 1,1-Dioxo-3-butyl-3-ethyl-5-phenyl-7-bromo-8-[1'-phenyl-1'-ethoxycarbonylmethoxy]-2,3,4,5-tetrahydro-1,5-benzothiazepine

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Reaction Steps

Ethyl α-bromophenylacetate (0.139 g), Na2CO3 (0.200 g) and tetrabutylammonium bromide (0.034 g) were added to a solution of 1,1-dioxo-3-butyl-3-ethyl-5-phenyl-7-bromo-8-hydroxy-2,3,4,5-tetrahydro-1,5-benzothiazepine (WO 96/16051; 0.200 g, 0.442 mmol) in MeCN (6 ml). The suspension was heated under reflux overnight before the solvent was removed under reduced pressure. The crude product was extracted (DCM/H2O) and purified by flash chromatography (Hex:EtOAc-5:1) to give the title compound 0.256 g (94%) as a white solid. NMR 0.65–0.85 (m, 6H), 0.95–1.65 (m, 8H), 3.00–3.15 (m, 2H), 3.50–3.80 (m, 2H), 3.70–3.80 (2s, 3H), 5.60 (s, 1H), 5.65 (d, 1H) 7.00–7.60 (m, 17H), 8.05–8.20 (2d, 1H).

Provenance & Evidence