4-(3-Bromopropyl)benzonitrile → 4-(3-{2-[3-(Tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-5-oxo-pyrrolidin-1-yl}-propyl)-benzonitrile

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Reaction Steps

Analogous to the procedure described for Example 1A, Step D, the anion derived from 5-[3-(tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-pyrrolidin-2-one (262.8 mg, 0.756 mmol) and NaHMDS (0.83 mL, 0.83 mmol) was reacted with 4-(3-bromo-propyl)-benzonitrile (186 mg, 0.832 mmol) at 70° C. for 24 h. Purification by medium pressure chromatography (5:1 hexanes:EtOAc to 1:1 hexanes:EtOAc to 1% MeOH in CH2Cl2 to 5% MeOH in CH2Cl2) provided 4-(3-{2-[3-(tert-butyl-dimethyl-silanyloxy)-4-phenyl-butyl]-5-oxo-pyrrolidin-1-yl}-propyl)-benzonitrile (257.6 mg). 1H NMR (CDCl3) δ7.56 (m, 2H), 7.26 (m, 5H), 7.13 (m, 2H), 3.85 (m, 1H), 3.62 (m, 1H), 3.48 (m, 1H), 2.93 (m, 1H), 2.82-2.60 (m, 4H), 2.29 (m, 2H), 1.88-1.25 (m, 7H); MS 491.5 (M+1).

Provenance & Evidence