Ethyl Acetate → 4-(3-{2-[3-(Tert-butyl-dimethyl-silanyloxy)-4-(3-fluoro-phenyl)-butyl]-5-oxo-pyrrolidin-1-yl}-propyl)-benzoic acid methyl ester

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Reaction Steps

Analogous to the procedure described in Compound 1A, Step D, 5-[3-(tert-butyl-dimethyl-silanyloxy)-4-(3-fluoro-phenyl)-butyl]-pyrrolidin-2-one (254.7 mg, 0.697 mmol) was alkylated with NaHMDS (1M in THF, 0.84 mL, 0.84 mmol) and 4-(3-bromo-propyl)-benzoic acid methyl ester (200 mg, 0.778 mmol). Purificaton by medium pressure chromatography (5:1 hexanes:EtOAc to 1:1 hexanes:EtOAc to EtOAc to 1% MeOH in CH2Cl2 to 5% MeOH in CH2Cl2) provided 4-(3-{2-[3-(tert-butyl-dimethyl-silanyloxy)-4-(3-fluoro-phenyl)-butyl]-5-oxo-pyrrolidin-1-yl}-propyl)-benzoic acid methyl ester (275.3 mg). 1H NMR (CDCl3) (selected peaks) δ 7.94 (d, 2H), 7.23 (m, 3H), 6.87 (m, 3H), 3.88 (s, 3H), 3.86 (m, 1H), 3.63 (m, 1H), 3.50 (m, 1H), 2.94 (m, 1H), 0.84 (s, 9H).

Provenance & Evidence