Sodium bis(trimethylsilyl)amide → 4-(2-{2-[3-(Tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-5-oxo-pyrrolidin-1-yl}-ethoxy)-benzoic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

Analogous to the procedure described for Compound 1A, Step D, 5-[3-(tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-pyrrolidin-2-one (prepared in Compound 1A, Step C) (250 mg, 0.719 mmol) was alkylated with NaHMDS (1M in THF, 0.86 mL, 0.86 mmol) and 4-(2-bromo-ethoxy)-benzoic acid ethyl ester (216 mg, 0.791 mmol). The reaction temperature was maintained at 50° C. over 24 h. Purification by radial chromatography (hexanes to 4:1 hexanes:EtOAc) provided 4-(2-{2-[3-(tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-5-oxo-pyrrolidin-1-yl}-ethoxy)-benzoic acid ethyl ester (66.4 mg). 1H NMR (CDCl3) (selected peaks) δ 7.96 (m, 2H), 7.29-7.13 (m, 5H), 6.84 (m, 2H), 4.33 (q, 2H), 4.12 (m, 2H), 3.90 (m, 2H), 3.68 (m, 1H), 3.34 (m, 1H), 2.73 (m, 2H), 2.32 (m, 2H), 1.36 (t, 3H), 0.85 (s, 9H), −0.03 (s, 3H), −0.15 (d, 3H).

Provenance & Evidence