反应详情

Trans-10a-[(4-chlorophenyl)sulfonyl]-1,4-difluoro-6a,9,10,10a-tetrahydrospiro[6H-dibenzo[b,d]pyran-8(7H), 2′-[1,3]dioxolane] (3.1 g, 6.8 mmole) was dissolved in 200 ml acetone and 10 ml water. Toluenesulfonyl chloride (1 g) was added and the mixture was refluxed overnight. Acetone was removed. 100 water and 100 ml EtOAc were added. The organic layer washed with water (50 ml), dried over Na2SO4 and concentrated. The residue was pure enough for next step. Yield: 2.8 g, 100%. 1H NMR (CDCl3 400 MHz δ 7.63 (d, J=8.1 Hz, 2H), 7.52 (d, J=8.8 Hz, 2H), 7.14 (m, 1H), 6.64 (m, 1H), 5.27 (dd, J=11.7 and 2.9 Hz, 1H), 4.13 (d, J=11.7 Hz, 1H), 3.18 (d, J=12.4 Hz, 1H), 2.79 (dt, J=12.4 and 3.7 Hz, 1H), 2.4-2.57 (m, 4H), 2.04-2.17 (m, 1H).

1. temperaturethe mixture was refluxed overnight
2. customAcetone was removed
3. addition100 water and 100 ml EtOAc were added
4. washThe organic layer washed with water (50 ml)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated