Methanol → (2S,4R)-1-((2S,3R)-2-((tert-butoxycarbonyl)amino)-3,5-dimethylnon-8-enoyl)-4-hydroxypyrrolidine-2-carboxylic acid

関与物質

反応手順

(2S,4R)-methyl 1-((2S,3R)-2-((tert-butoxycarbonyl)amino)-3,5-dimethylnon-8-enoyl)-4-hydroxypyrrolidine-2-carboxylate (10.8 g, 25.3 mmol) was dissolved in THF (50 mL) and MeOH (50 mL) and to this solution was added LiOH (2.425 g, 101 mmol) in Water (50.0 mL). The reaction mixture was stirred at rt for 16 h. The solvent was removed under vacuum and the resulting aqueous residue was diluted with water, and EtOAc. The mixture was neutralized with 1 N HCl and adjusted the pH˜2.5 and the mixture was extracted with EtOAc. The organic layer was collected, washed with brine, dried over Na2SO4, and concentrated to give crude (2S,4R)-1-((2S,3R)-2-((tert-butoxycarbonyl)amino)-3,5-dimethylnon-8-enoyl)-4-hydroxypyrrolidine-2-carboxylic acid (12 g) as yellow viscous oil. MS: MS m/z 413.2 (M++1).

情報源と証拠