反应详情

Combine the compound of step 1 (95 mg, 0.21 mmol), H2O2 (25 μl) and K2CO3 (15 mg, 0.10 mmol) in DMSO (0.8 mL), and stir the mixture at room temperature overnight. Add water and extract the aqueous layer with EtOAc. Dry the organic layer over Na2SO4 and eliminate the solvent. Purify by flash chromatography (EtOAc/hexane 50/50) to give a yellow oil. Dissolve the oil in CH2Cl2 (3 mL) and add trifluoroacetic acid (240 μL), and stir the mixture at room temperature for 4 hour. Eliminate the solvent. Purify by an SCX column to give the title compound (57 mg, 76%). Electrospray MS M+1 ion=381. 1H-NMR (CDCl3, 400 MHz): 7.82 (d, 1H, J=8.5 Hz), 7.35-7.20 (m, 7H), 6.99-6.95 (m, 3H), 6.90 (dd, 11, J=2.5 and 8.5 Hz), 6.53 (m, 2H), 3.83 (s, 2H), 2.95-2.89 (m, 2H), 2.86-2.81 (m, 2H).

1. extractionAdd water and extract the aqueous layer with EtOAc
2. dry with materialDry the organic layer over Na2SO4
3. customPurify by flash chromatography (EtOAc/hexane 50/50)
4. customto give a yellow oil
5. customPurify by an SCX column