Reaction Steps
The product of Step 4 was dissolved in THF (1 mL) and cooled to 0° C. Tetra-butyl ammonium fluoride (10 μL, 0.078 mmol) was added and the reaction mixture was warmed to RT and allowed to stir overnight. The reaction mixture was quenched with saturated ammonium chloride, extracted with ether, dried and concentrated. Purification by preparatory TLC (silica plate, 5% MeOH/Ethyl acetate) afforded 6.1 mg (96.8%) of (5S,6R,E)-methyl 5,6-dihydroxy-8-(2-((R,E)-3-hydroxyoct-1-enyl)phenyl)oct-7-enoate. 1H NMR (250 Hz, CDCl3): δ 7.38 (m, 2H), 7.22 (m, 2H), 6.86 (t, J=15.4 Hz, 1H), 6.07 (m, 1H), 4.27 (m, 1H), 3.77 (m, 1H), 3.63 (m, 1H), 3.46 (q, J=14 Hz, 6.9 Hz, 1H), 2.35 (t, J=7.5 Hz, 2H), 1.81-1.53 (m, 4H), 1.32-1.16 (m, 7H), 0.915-0.789 (m, 4H). 13C (500 NMR C6D6): δ 173.79, 136.18, 136.12, 135.98, 131.59, 130.34, 136.18, 131.59, 130.34, 128.53, 128.20, 127.81, 127.68, 127.62, 127.47, 127.13, 76.02, 74.36, 72.65, 51.01, 37.92, 33.83, 32.22, 30.15, 25.58, 23.05, 21.57, 14.24.
