反应详情

温度

60 °C

The title compound of step B (3.07 g, 5.7 mmol) was dissolved in tetrahydrofuran (30 mL) and treated with isopropylamine (1.69 g, 28.7 mmol). The mixture was heated at 60° C. for 2 hours and concentrated to dryness under reduced pressure. The residue was subjected to chromatography on silica gel using ethyl acetate/hexanes (40:60) as eluent. Pooling appropriate fractions and evaporation of solvent provided the title compound of Step C (2.4 g): m.p.: 199–200° C. 1H NMR (CDCl3): δ 10.3 (NH), 8.42 (1H), 7.84 (1H), 7.61 (1H), 7.44 (2H), 7.42 (1H), 6.01 (1H), 4.21 (m, 1H), 2.13 (s, 3H), 1.2 (6H).

1. concentrationconcentrated to dryness under reduced pressure
2. customPooling appropriate fractions and evaporation of solvent