2-Methylpyrrolidine → 1H-Indolamine

HRID 966489Notes

Reaction equation

HRID 966489 reaction equation
C(OC([C:11]1[C:19]2[C:14](=[CH:15][CH:16]=[C:17](CCOS(C)(=O)=O)[CH:18]=2)[NH:13][C:12]=1C)=O)C1C=CC=CC=1.CC1CCC[NH:30]1>O1CCOCC1>[NH:13]1[C:14]2[C:19](=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH:11]=[C:12]1[NH2:30]

Participants

4

Reactant 2

HCID 130032-MethylpyrrolidineHCID 233938525-(2-Methanesulfonyloxy-ethyl)-2-methyl-1H-indole-3-carboxylic Acid Benzyl Ester

Product 1

HCID 1220741H-IndolamineYield 252.2%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

5-(2-Methanesulfonyloxy-ethyl)-2-methyl-1H-indole-3-carboxylic acid benzyl ester (0.350 g, 0.900 mmol, 1 eq, Example 56, Step D) was suspended in dioxane (20 mL) under Ar. 2-Methyl-pyrrolidine (0.207 g, 1.800 mmol, 2 eq) was added. The reaction mixture was stirred and heated to reflux for 18 hours. Then the reaction was quenched with saturated sodium bicarbonate and extracted with ethyl acetate (3×). The combined organic phases were washed with brine and dried over Na2SO4. After removing the solvent, the residue was loaded on silica gel and chromatographed, eluting with ethyl acetate/methanol/triethyl amine (100/10/1). 0.300 g (88%) of the indole-amine was obtained as a white solid. This was converted to the HCl. salt. LC/MS (ESI+) 377 (M+1); Anal. Calcd for C24H28N2O2.1HCl.0.75H2O: C, 67.59; H, 7.21; N, 6.57; Found: C, 67.79; H, 7.16; N, 6.50.

Workup

  1. temperatureheated
  2. temperatureto reflux for 18 hours
  3. customThen the reaction was quenched with saturated sodium bicarbonate
  4. extractionextracted with ethyl acetate (3×)
  5. washThe combined organic phases were washed with brine
  6. dry with materialdried over Na2SO4
  7. customAfter removing the solvent
  8. customchromatographed
  9. washeluting with ethyl acetate/methanol/triethyl amine (100/10/1)

Sources & evidence

ORD record
ord-b9260cb82c2143b5bfb5c3c56c3176b7
Source dataset
uspto-grants-2005_10
Patent number
US06951848B2

Reaction notes

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