反应详情

To a solution of #167 (238 mg, 0.963 mmol, 1 eq.) dissolved in methanol (2.6 mL) was added an aqueous solution of sodium hydroxide (2.5 M, 0.88 mL) and the reaction was stirred at room temperature for 3 hours. The reaction was then quenched with 10% aqueous citric acid (5 mL) and ethyl acetate (100 mL) was added, and the layers were separated. The organic layer was washed with 10% citric acid, water, and brine, then dried over sodium sulfate, filtered and concentrated in vacuo to afford #169 as a white solid (221 mg, 99%). 1H NMR (400 MHz, CDCl3), δ 3.96-3.69 (m, 3H), 3.59 (m, 1H), 2.59-2.33 (m, 2H), 1.51 (s, 9H). LC-MS (Protocol Q1): m/z 232.1 [M−H+], retention time=0.67 minutes. Chiral HPLC retention time: 3.95 min (purity=98%)(Column: Chiralpak AD-H, 4.6 mm×25 cm, mobile phase 5-60% CO2/Methanol, flow rate 3.0 mL/min); Optical rotation: [α]D25−3.6 (c=0.55, MeOH)

1. customThe reaction was then quenched with 10% aqueous citric acid (5 mL) and ethyl acetate (100 mL)
2. additionwas added
3. customthe layers were separated
4. washThe organic layer was washed with 10% citric acid, water, and brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo