反应详情

Trifluoroacetic acid (TFA, 16 mL) was added to (B) (2.59 g, 8.51 mmol), and the solution stirred at room temperature for 20 min (Drierite tube). Excess TFA was removed on the rotovap, saturated NaHCO3 (50 mL) was added and the product was extracted into ether (3×50 mL). After a brine wash (50 mL), the organic extracts were concentrated to yield 1.77 g crude product. Column chromatography with 3% EtOH/CHCl3 furnished 1.31 g of (3) (75% yield), which has been previously prepared: NMR δ1.5-1.7 (m, 4 H), 2.16-2.35 (m, 2 H), 2.78-2.98 (m, 2 H), 4.66 (s, 2 H), 5.45 (br s, 1 H), 7.28 (s, 5 H).

1. customExcess TFA was removed on the rotovap, saturated NaHCO3 (50 mL)
2. additionwas added
3. extractionthe product was extracted into ether (3×50 mL)
4. washAfter a brine wash (50 mL)
5. concentrationthe organic extracts were concentrated
6. customto yield 1.77 g crude product