3-(2-Methoxy-4-methoxycarboxybenzyl)-5-nitroindole → Methyl 4-(5-aminoindol-3-ylmethyl)-3-methoxybenzoate

HRID 1756362Notes

Reaction equation

HRID 1756362 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:10]=[CH:11][C:12]=1[CH2:13][C:14]1[C:22]2[C:17](=[CH:18][CH:19]=[C:20]([N+:23]([O-])=O)[CH:21]=2)[NH:16][CH:15]=1)[C:6]([O:8][CH3:9])=[O:7]>O1CCCC1.[Pd]>[NH2:23][C:20]1[CH:21]=[C:22]2[C:17](=[CH:18][CH:19]=1)[NH:16][CH:15]=[C:14]2[CH2:13][C:12]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[CH:4][C:3]=1[O:2][CH3:1]

Participants

4

Reactant 1

HCID 114732633-(2-Methoxy-4-methoxycarboxybenzyl)-5-nitroindole

Product 1

HCID 23365920Methyl 4-(5-aminoindol-3-ylmethyl)-3-methoxybenzoateYield 82%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 8028TetrahydrofuranSolvent

Procedure

Palladium-on-carbon (10% w/w; 0.25 g.) was added to a solution of (C) (1.5 g.) in tetrahydrofuran (50 ml.) in a hydrogenation bottle. The mixture was hydrogenated at 3.45 bars for 2 hours. The catalyst was removed by filtration through diatomaceous earth and the filtrate was evaporated. The residual oil was purified by flash chromatography on silica gel (200 ml.) eluting with 1:1 v/v ethyl acetate:hexane, to give methyl 4-(5-aminoindol-3-ylmethyl)-3-methoxybenzoate (A) (1.12 g. , 82%) as a viscous oil; 3.29(br,2H,NH2), 3.88(s,3H, CO.OCH3), 3.91(s,3H, OCH3), 4.03(s,2H, CH2.Ar), 6.64(dd,1H), 6.78(m,2H), 7.10(m,2H), 7.44(m,2H), 7.68(br,1H, H1 -indole).

Workup

  1. customThe catalyst was removed by filtration through diatomaceous earth
  2. customthe filtrate was evaporated
  3. customThe residual oil was purified by flash chromatography on silica gel (200 ml.)
  4. washeluting with 1:1 v/v ethyl acetate

Sources & evidence

ORD record
ord-2175021d5912437b8d26456417854cf7
Source dataset
uspto-grants-1995_08
Patent number
US05440035

Reaction notes

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