反应详情

Activated zinc was prepared from 10 g of zinc and the reduction carried out using the procedure described in Helv. Chim. Acta (1987), Vol. 70, p. 1025). A solution of (5S,6R,7E,9E,13E,15S)-16-(4-fluorophenoxy)-5,6,15-trihydroxy-3-oxahexadeca-7,9,13-trien-11-ynoic acid, methyl ester, (0.8 g, 1.2 mmol) in methanol (4 mL) was added to a slurry of activated zinc in 1:1 methanol:water (45 mL). The flask was stirred vigorously under nitrogen for 24-60 hours. The mixture was filtered through a pad of Celite 545 and rinsed with methanol (3×25 mL). Purification by chromatography on a reverse phase semi-prep column using a gradient of acetonitrile and water afforded 55 mg of (5S,6R,7E,9E,11Z,13E,15S)-16-(4-fluorophenoxy)-5,6,15-trihydroxy-3-oxa-7,9,11,13-hexadecatetraenoic acid, methyl ester, as an oil; 1H-NMR (400 mHz, methanol-d4) δ 3.62 (m, 2H), 3.75 (s, 3H), 3.93 (m, 2H), 4.13 (m, 3H), 4.58 (m, 1H), 5.85 (m, 2H), 6.14 (m, 2H), 6.36 (m, 2H), 6.77 (m, 1H), 6.96 (m, 5H) ppm.

1. filtrationThe mixture was filtered through a pad of Celite 545
2. washrinsed with methanol (3×25 mL)
3. customPurification by chromatography on a reverse phase semi-prep column