反应详情

(R,R,R)-2-allyl-3-(3-hydroxy-3,7,11,15-tetramethyl-hexadecyl)-5,6-dimethyl-[1,4]benzoquinone (Ex-1D-4) (50 mg, 0.1 mmol) was hydrogenated using PtO2 (5 mg) at 50 psi for 2 h in a solution of EtOAc (5 mL). The suspension was filtered through celite, which was rinsed with DCM (2×2 mL). The pale yellow solution was concentrated by rotary evaporation to yield a pale yellow oil (Ex-1D-5). The oil was dissolved in DCM (5 mL) and stirred with silica (˜20 mg) for 5 days. The bright yellow suspension was filtered through a cotton plug and concentrated by rotary evaporation to yield (R,R,R)-2-(3-hydroxy-3,7,11,15-tetramethyl-hexadecyl)-5,6-dimethyl-3-propyl-[1,4]benzoquinone (Ex-1D-6) as a bright yellow oil (38 mg, 76%). 1H NMR (400 MHz, CDCl3) δ (ppm): 2.57-2.52 (m, 2H), 2.48-2.44 (m, 2H), 2.02 (s, 6H), 1.57-1.04 (m, 26H), 0.99 (t, J=7.4 Hz, 3H), 0.89-0.85 (m, 15H).

1. customfor 2 h
2. filtrationThe suspension was filtered through celite, which
3. washwas rinsed with DCM (2×2 mL)
4. concentrationThe pale yellow solution was concentrated by rotary evaporation
5. customto yield a pale yellow oil (Ex-1D-5)
6. filtrationThe bright yellow suspension was filtered through a cotton plug
7. concentrationconcentrated by rotary evaporation