反应详情

温度

25 °C

A solution of 0.70 g (2.90 mmol) of 2 and 1.00 g (7.20 mmol) of 6 in 10 mL of toluene in a sealed tube was heated at 150° C. for 1 day, cooled to 25° C., concentrated to dryness, and column chromatographed on silica gel using a gradient mixture of hexane and ethyl acetate as solvent gave 0.52 g (48% yield) of compounds 5 as a mixture of exo- and endo-(1:1) isomers along with 0.62 g of 6. The exo- and endo-isomers were partially separated by silica gel column and the stereochemistry have not assigned. Compound 5, less polar isomer: MS, m/z 376 (M+), 375. 1H NMR d 7.24-7.18 (m, 2H), 7.08-7.04 (m, 2H), 6.65 (s, 2H, C6,7 Hs), 5.61 (s, 1H), 5.33 (bs, 2H), 3.82 (s, 6H, OMe), 3.48 (s, 3H, OMe), 3.12 (ABd, J=9 Hz, 1H), 3.06 (ABd, J=9 Hz, 1H). More polar isomer: MS, m/z 376 (M+), 375. 1H NMR d 7.40 (m, 2H), 7.16 (m, 2H), 6.60 (ABd, J=8.8 Hz, 1H), 6.56 (Abd, J=8.8 Hz, 1H), 5.65 (s, 1H, ═CH), 5.33 (bs, 2H, C9,10 Hs), 3.76 (s, 3H, OMe), 3.73 (s, 3H, OMe), 3.51 (s, 3H, OMe), 3.13 (Abd, J=9 Hz, 1H), 3.08 (Abd, J=9 Hz, 1H). This mixture of compounds was used in the next step.

1. concentrationconcentrated to dryness, and column
2. customchromatographed on silica gel using
3. additiona gradient mixture of hexane and ethyl acetate as solvent