反应详情

A solution of methyl ester 15 (2.15 g, 2.94 mmol) in MeOH/THF/H2O (30 mL/30 mL/15 mL) was charged with NaOH (589 mg, 14.7 mmol) and the reaction mixture was stirred at room temperature for 1 h. After completion of the reaction, the mixture was concentrated under reduced pressure and the pH was adjusted to 5 with 1 N HCl. The suspension was partitioned between CH2Cl2 (50 mL) and water (50 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (2×50 mL). The combined organic extracts were dried over Na2SO4 and concentrated to afford compound 16 (1.80 g, 86%) as a white solid, which was used directly in the next step: 1H NMR (400 MHz, CD3OD) δ 4.07-4.00 (m, 1H), 4.00-3.91 (m, 1H), 3.35 (t, J=7.2 Hz, 2H), 3.25-3.10 (m, 2H), 1.89-1.23 (m, 12H), 1.52 (s, 9H), 1.46 (s, 9H), 1.438 (s, 9H), 1.436 (s, 9H).

1. customAfter completion of the reaction
2. concentrationthe mixture was concentrated under reduced pressure
3. customThe suspension was partitioned between CH2Cl2 (50 mL) and water (50 mL)
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted with CH2Cl2 (2×50 mL)
6. dry with materialThe combined organic extracts were dried over Na2SO4
7. concentrationconcentrated