反应详情

Dess-Martin periodinane (1.0 g, 2.36 mmol) was added to a solution of benzofuran-2-carboxylic acid {(S)-1-[(3S,4S,7R)-3-hydroxy-7-methyl-1-(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-3-methyl-butyl}-amide and benzofuran-2-carboxylic acid {(S)-1-[(3R,4R,7S)-3-hydroxy-7-methyl-1-(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-3-methyl-butyl}-amide (0.8 g, 1.48 mmol) in CH2Cl2 (20 ml) and was stirred at RT for 45 minutes. The solution was washed with 10% NaHCO3 and brine. Purification by column chromatography (60% ethyl acetate/hexanes) gave the title compound as a mixture of diasteromers (0.75 g, 94%); The diastereomers were separated by HPLC. Diastereomer 1:1H NMR: 8.72 (m, 1H), 8.0 (d, 1H), 8.92 (dd, 1H), 7.65 (d, 1H), 7.56 (d, 1H), 7.45 (s, 1H), 7.42 (dd, 2H), 7.28 (d, 1H), 7.10 (d, 1H), 5.15 (m, 1H), 4.77 (d, 1H), 4.68 (m, 1H), 4.40 (m, 1H), 3.86 (d, 1H), 2.20-2.08 (m, 2H), 1.78-1.50 (m, 5H), 1.22 (dd, 3H), 0.98 (m, 6H); Electrospray mass spec: M+H+=541.2; Diastereomer 2:1H NMR: 8.68 (m, 1H), 8.04 (d, 1H), 8.92 (dd, 1H), 7.68 (d, 1H), 7.58 (d, 2H), 7.52 (s, 1H), 7.42 (dd, 1H), 7.29 (d, 1H), 7.05 (m, 2H), 5.12 (m, 1H), 4.75-4.68 (m, 1H), 4.43 (m, 1H), 3.83 (d, 1H), 2.25-2.12 (m, 2H), 1.88-1.50 (m, 5H), 0.98 (m, 9H); Electrospray mass spec: M+H+=541.2

1. washThe solution was washed with 10% NaHCO3 and brine
2. customPurification by column chromatography (60% ethyl acetate/hexanes)