反应详情

温度

80 °C

To a suspension of 9.6 g (40.8 mmol) 1-(3-methylanilino)phthalazine and 173 g 1,3,5-trioxane in 570 ml acetonitrile, 3.12 ml (40.8 mmol) trifluoroacetic acid, 11.0 ml (80% in tBuOOtBu; 87.4 mmol) tBuOOH and 190 mg (0.68 mmol) FeSO4.7 H2O are added, and the mixture stirred for 17 h at 80° C. The cooled reaction mixture is partly evaporated in the RE, diluted with EtOAc and water and adjusted to an alkaline pH with 1 N NaOH. The aqueous phase is separated off and twice extracted with EtOAc. The organic phases are washed twice with water and brine, dried (Na2SO4) and evaporated. Column chromatography (SiO2; EtOAc/toluene 1:3; applied as solution in dichloromethane/acetone 9:1) yields the title compound after crystallization with the addition of DIPE; m.p. 161° C.; DC (EtOAc/toluene 1:3) Rf=0.27; 1H-NMR (DMSO-d6) 9.27 (s, HN), 8.74 (m, 1H), 8.61 (m, 1H), 8.00 (m, 2H), 7.72 (s, 1H), 7.68 (d, 1H), 7.25 (t, 1H), 6.89 (d, 1H), 6.39 (s, 1H), 5.47 (d, 2H), 5.41 (d, 2H), 2.33 (s, 3H); FAB-MS (M+H)+=324; anal. calc.(C18H17N3O3) C, 66.86%; H, 5.30%; N, 13.00%; meas. C, 66.83%; H, 5.36%; N, 12.81%.

1. customThe cooled reaction mixture
2. customis partly evaporated in the RE
3. additiondiluted with EtOAc and water
4. customThe aqueous phase is separated off
5. extractiontwice extracted with EtOAc
6. washThe organic phases are washed twice with water and brine
7. dry with materialdried (Na2SO4)
8. customevaporated