Chloroform → 1-methoxy-6,7,8,9-tetrahydro-5H-benzo[7]annulen-6-one

反応式

[CH3:1][O:2][C:3]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:4]=1[CH2:5][CH2:6][CH2:7][C:8]2=[CH2:13].O.O.O.[N+]([O-])([O-])=[O:18].[Tl+3].[N+]([O-])([O-])=O.[N+]([O-])([O-])=O.C(Cl)(Cl)Cl>CO>[CH3:1][O:2][C:3]1[C:4]2[CH2:5][CH2:6][CH2:7][C:13](=[O:18])[CH2:8][C:9]=2[CH:10]=[CH:11][CH:12]=1

参加物

実験手順

5-Methoxy-1-methylene-1,2,3,4-tetrahydro-naphthalene (23.8 g, 0.137 mol) in 150 mL MeOH added in one portion to freshly prepared solution of thallium(III)nitrate trihydrate (1.0 eq) in 300 mL MeOH. Stirred one minute and 400 mL chloroform added. The solution was filtered and the organics partitioned between dichloromethane and water. The organics were dried (MgSO4) and concentrated. Purification by chromatography (ISCO, 330 g silica cartridge; stepwise elution hexane (5 min) then 7 minute gradient to 100% dicloromethane (20 min) affords the title compound as the most polar of the products as a pale yellow oil (26 g, 97%). 1H-NMR (400 MHz, CDCl3) 7.16 (t, J=7.9 Hz, 1H), 7.84 (d, J=8.3 Hz, 1H), 6.79 (d, J=7.5 Hz, 1H), 3.84 (s, 3H), 3.73 (s, 2H), 3.05-3.01 (m, 2H), 2.55 (t, J=7.0 Hz, 2H), 2.01-1.96 (m, 2H). LC/MS (ESI+) m/z=191 (M+H)+