反应详情

1M-sodium hydroxide (2 mL) was added to a solution of the product (60 mg) from step (vi) in methanol (2 mL) and the mixture was stirred at RT for 9 h. The reaction mixture was concentrated, diluted with water and washed with chloroform. The aqueous layer was neutralized with 2M-hydrogen chloride and extracted with chloroform/EtOH (3/1). The combined organic layer was dried and concentrated. The residue was diluted with chloroform, filtered, concentrated under reduced pressure to afford the sub-title compound (48 mg) as a white solid; 1H NMR (CDCl3); 6.79 (1H, d), 6.48 (1H, d), 6.38 (1H, dd), 6.17 (1H, br s), 5.24 (1H, br s), 4.20-3.97 (3H, m), 3.85 (3H, s), 3.70-3.58 (1H, m), 3.55 (2H, s), 3.48-3.34 (2H, m), 3.32-3.15 (2H, m), 3.05-2.80 (1H, m), 2.75-2.55 (1H, m), 2.35 (3H, s), 2.30-2.07 (4H, m), 2.05-1.85 (2H, m), 1.85-1.70 (1H, m), 1.48-1.34 (1H, m), 1.33-0.98 (4H, m), 0.77 (3H, t); LC-MS: m/z 516.

1. concentrationThe reaction mixture was concentrated
2. additiondiluted with water
3. washwashed with chloroform
4. extractionextracted with chloroform/EtOH (3/1)
5. customThe combined organic layer was dried
6. concentrationconcentrated
7. additionThe residue was diluted with chloroform
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure