Ammonium Chloride → 1-benzenesulfonyl-N*4*-((R)-1-benzyl-piperidin-3-yl)-1H-pyrrolo[2,3-b]pyridine-4,5-diamine

HRID 1257575Notes

Reaction equation

HRID 1257575 reaction equation
[C:1]1([S:7]([N:10]2[C:14]3=[N:15][CH:16]=[C:17]([N+:33]([O-])=O)[C:18]([NH:19][C@@H:20]4[CH2:25][CH2:24][CH2:23][N:22]([CH2:26][C:27]5[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=5)[CH2:21]4)=[C:13]3[CH:12]=[CH:11]2)(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Cl-].[NH4+]>C(O)C.O.[Fe]>[C:1]1([S:7]([N:10]2[C:14]3=[N:15][CH:16]=[C:17]([NH2:33])[C:18]([NH:19][C@@H:20]4[CH2:25][CH2:24][CH2:23][N:22]([CH2:26][C:27]5[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=5)[CH2:21]4)=[C:13]3[CH:12]=[CH:11]2)(=[O:8])=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

5

Reactant 2

HCID 25517Ammonium ChlorideHCID 58395364(1-benzenesulfonyl-5-nitro-1H-pyrrolo[2,3-b]pyridin-4-yl)-((R)-1-benzyl-piperidin-3-yl)amine

Product 1

HCID 583947461-benzenesulfonyl-N*4*-((R)-1-benzyl-piperidin-3-yl)-1H-pyrrolo[2,3-b]pyridine-4,5-diamineYield 85.3%

Reagents, catalysts & solvents 2

HCID 23925IronCatalystHCID 19096565Water ethanolSolvent

Procedure

A mixture of (1-benzenesulfonyl-5-nitro-1H-pyrrolo[2,3-b]pyridin-4-yl)-((R)-1-benzyl-piperidin-3-yl)amine (about 0.77 mmol), iron powder (129 mg, 2.31 mmol) and ammonium chloride (206 mg, 3.85 mmol) in ethanol/water (8 ml, 3:1) was heated to reflux for 4 hours. After cooling the mixture was filtered through CELITE®, thoroughly washing the filter cake with ethanol. The filtrate and washings were combined and concentrated under vacuum. The resulting residue was partitioned between ethyl acetate and water, and the organic layer dried with sodium sulfate and concentrated under vacuum. Purification by column chromatography on silica gel (gradient: 0 to 10% methanol in DCM) gave a residue, which was purified by column chromatography on silica gel (gradient: 0 to 5% methanol in ethyl acetate) affording 303 mg (84%) of 1-benzenesulfonyl-N*4*-((R)-1-benzyl-piperidin-3-yl)-1H-pyrrolo[2,3-b]pyridine-4,5-diamine. LCMS (Method B, ESI): RT=2.48-2.68 min, m+H=462.6; 1H NMR (400 MHz, CDCl3) δ: 8.12-8.08 (m, 2H), 7.79 (s, 1H), 7.55-7.49 (m, 1H), 7.46-7.38 (m, 3H), 7.37-7.22 (m, 5H), 6.47 (s, 1H), 5.32-5.26 (br m, 1H), 4.00-3.87 (br m, 1H), 3.58-3.46 (br m, 2H), 2.94-2.28 (br m, 6H), 1.82-1.67 (br m, 2H).

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 4 hours
  3. temperatureAfter cooling the mixture
  4. filtrationwas filtered through CELITE®
  5. washthoroughly washing the filter cake with ethanol
  6. concentrationconcentrated under vacuum
  7. customThe resulting residue was partitioned between ethyl acetate and water
  8. dry with materialthe organic layer dried with sodium sulfate
  9. concentrationconcentrated under vacuum
  10. customPurification by column chromatography on silica gel (gradient: 0 to 10% methanol in DCM)
  11. customgave a residue, which
  12. customwas purified by column chromatography on silica gel (gradient: 0 to 5% methanol in ethyl acetate)

Sources & evidence

ORD record
ord-fc01f74ebdd84098a1569f96d8f93c60
Source dataset
uspto-grants-2013_06
Patent number
US08461328B2

Reaction notes

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