Reaktion #90686

Reaktionsgleichung

sulfolane

methyl 6-bromo-1-sec-butyl-3-formyl-1H-indole-4-carboxylate

p-toluenesulfonic acid mono hydrate

sodium cyanoborohydride

→

methyl 6-bromo-1-sec-butyl-3-methyl-1H-indole-4-carboxylate

Ausbeute 54.6%

Lösungsmittel

water

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction mixture was cooled to room temperature
2. 2
   workup.STIRRINGstirred at 100° C. for 2 h
3. 3
   TemperaturThe reaction mixture was cooled to room temperature
4. 4
   workup.STIRRINGstirred at the same temperature for 16 h
5. 5
   Extraktionextracted with 30% EtOAc
6. 6
   WaschenThe organic layer was washed with cold water (100 mL), brine (100 mL)
7. 7
   Trocknendried over anhydrous Na2SO4
8. 8
   Einengenconcentrated under reduced pressure
9. 9
   Sonstigeto afford crude, which
10. 10
    Sonstigewas purified by column chromatography over silica gel (100-200 mesh)

Vorschrift

To a stirred solution of methyl 6-bromo-1-sec-butyl-3-formyl-1H-indole-4-carboxylate (15 g, 44.6 mmol) in DMF (115 mL) was added p-toluenesulfonic acid mono hydrate (1.1 g, 5.8 mmol), p-toluenesulfonyl hydrazide (10.8 g, 58 mmol) followed by sulfolane (115 mL) at RT and the reaction mixture was stirred at 100° C. for 1 h. The reaction mixture was cooled to room temperature, treated with sodium cyanoborohydride (11.9 g, 178.5 mmol) portion wise over a period of 5 min and stirred at 100° C. for 2 h. The reaction mixture was cooled to room temperature and stirred at the same temperature for 16 h. The reaction mixture was diluted with water and extracted with 30% EtOAc: Pet ether. The organic layer was washed with cold water (100 mL), brine (100 mL) and dried over anhydrous Na2SO4 and concentrated under reduced pressure to afford crude, which was purified by column chromatography over silica gel (100-200 mesh) using 5% EtOAc: Pet ether as eluent to afford title compound methyl 6-bromo-1-sec-butyl-3-methyl-1H-indole-4-carboxylate (7.88 g, 54.6%) as pale yellow gum. 1H NMR (CDCl3, 400 MHz): δ 0.804-0.841 (t, J=7.4 Hz, 3H), 1.454-1.470 (d, J=6.4 Hz, 3H), 1.865-1.884 (m, 2H), 2.363 (s, 3H), 3.950 (s, 3H), 4.265-4.316 (m, 1H), 7.038 (s, 1H), 7.609 (d, J=1.2 Hz, 1H), 7.671 (d, J=2 Hz, 1H). MS (ES+): 324.19 [M+H] ion present.

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