反应详情

3-(2-pyridin-4-ylethyl)-1H-indole (667 mg, 3 mmol, synthesis cf. WO2008009415, indole unit Ind-14) together with 4-butyl-4-(dimethylamino)cyclohexanone (592 mg, 3 mmol, synthesis cf. WO2008009415, ketone unit Ket-4) was dissolved in dichloromethane (45 ml) and mixed with trifluoromethane sulphonic acid (0.553 ml, 6.3 mmol). The batch was stirred for 67 h at RT, and a brown oil separated out. For work up the reaction solution was mixed with 1N NaOH (10 ml) and THF (10 ml). The mixture was stirred a further 60 min. After separation of the phases the aqueous phase was extracted with dichloromethane (3×10 ml). The combined organic extracts were dried over Na2SO4 and then concentrated to low volume. The raw product obtained (1.24 g) was purified by column chromatography [silica gel 60 (100 g); ethyl acetate/methanol (10:1, 1200 ml), ethyl acetate/methanol (5:1, 600 ml) ethyl acetate/methanol (2:1, 700 ml), ethyl acetate/methanol (1:2, 750 ml), methanol (800 ml)].

1. customa brown oil separated out
2. additionFor work up the reaction solution was mixed with 1N NaOH (10 ml) and THF (10 ml)
3. stirringThe mixture was stirred a further 60 min
4. customAfter separation of the phases the aqueous phase
5. extractionwas extracted with dichloromethane (3×10 ml)
6. dry with materialThe combined organic extracts were dried over Na2SO4
7. concentrationconcentrated to low volume