反应详情

Analogous to the procedure described for Compound 1A, Step D, 5-[4-biphenyl-3-yl-3-(tert-butyl-dimethyl-silanyloxy)-butyl]-pyrrolidin-2-one (5.116 g, 12.08 mmol) was alkylated with 4-(3-bromo-propyl)-benzoic acid methyl ester (3.41 g, 13.3 mmol) over 20 h. Purification by medium pressure chromatography using a solvent gradient (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-[4-biphenyl-3-yl-3-(tert-butyl-dimethyl-silanyloxy)-butyl]-5-oxo-pyrrolidin-1-yl}-propyl)-benzoic acid methyl ester (5.38 g). 1H NMR (CDCl3) δ 7.93 (d, 2H), 7.56 (d, 2H), 7.43 (m, 3H), 7.34 (m, 3H), 7.23 (m, 2H), 7.12 (m, 1H), 3.89 (m, 1H), 3.87 (s, 3H), 3.64 (m, 1H), 3.49 (m, 1H), 2.95-2.61 (m, 5H), 2.30 (m, 2H), 2.01 (m, 1H), 1.89-1.70 (m, 3H), 1.59-1.24 (m, 4H), 0.84 (s, 9H), −0.04 (d, 3H), −0.16 (d, 3H).

1. customPurification by medium pressure chromatography