反应详情

温度

-78 °C

To a solution of (1S,2R,4aS,8aS)-1-(2,4-dimethoxyphenoxymethyl)-2,5,5,8a-tetramethyl-decahydronaphthalen-2-ol (41) (0.90 g, 2.4 mmol) in CH2Cl2 (20 mL), cooled to −78° C., a solution of SnCl4 (1.11 mL, 9.56 mmol) in CH2Cl2 (10 mL) was added dropwise. The temperature was maintained at −78° C. for 4 h then the mixture was allowed to warm to room temperature overnight. The reaction was quenched with water (50 mL). The organic layer was separated, dried (Na2SO4) and concentrated. Purification by column chromatography on silica gel (Hexanes/EtOAc, 4:1) gave (1R,10R,11S,16S)-4,6-dimethoxy-1,11,15,15-tetramethyl-8-oxatetracyclo[8.8.0.02,7.011,16]octadeca-2,4,6-triene (Compound No. 42) (0.69 g, 80%) as a viscous yellow oil. 1H NMR (CDCl3): δ 6.33 (d, 1H), 6.00 (d, 1H), 4.45 (m, 1H), 4.18 (t, 1H), 3.83 (s, 3H), 3.75 (s, 3H), 2.25 (m, 1H) 1.80-1.38 (m, 7H), 1.35 (s, 3H), 1.25-1.00 (m, 4H) 0.92 (s, 3H), 0.87 (s, 3H), 0.82 (s, 3H).

1. temperatureto warm to room temperature overnight
2. customThe reaction was quenched with water (50 mL)
3. customThe organic layer was separated
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated
6. customPurification by column chromatography on silica gel (Hexanes/EtOAc, 4:1)