반응 #70787

반응 방정식

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

수율 54.6%

용매

water

DMF

반응 조건

후처리

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

실험 절차

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.

출처