Ammonium formate → (2,2-dimethyl-1,3-dioxolan-4-yl)methyl-1H-indol-5-amine

HRID 1991809Notes

Reaction equation

HRID 1991809 reaction equation
C([C:5]1[N:6]([CH2:17][C@@H:18]2[CH2:22][O:21][C:20]([CH3:24])([CH3:23])[O:19]2)[C:7]2[C:12]([CH:13]=1)=[CH:11][C:10]([N+:14]([O-])=O)=[CH:9][CH:8]=2)(C)(C)C.C([O-])=O.[NH4+]>C(O)C.O.[Pd]>[CH3:23][C:20]1([CH3:24])[O:19][CH:18]([CH2:17][N:6]2[C:7]3[C:12](=[CH:11][C:10]([NH2:14])=[CH:9][CH:8]=3)[CH:13]=[CH:5]2)[CH2:22][O:21]1

Participants

6

Reactant 2

HCID 2723923Ammonium formateHCID 59129186(R)-2-tert-butyl-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-5-nitro-1H-indole

Product 1

HCID 69909767(2,2-dimethyl-1,3-dioxolan-4-yl)methyl-1H-indol-5-amineYield 120.4%

Reagents, catalysts & solvents 3

HCID 23938PalladiumCatalystHCID 702EthanolSolventHCID 962WaterSolvent

Procedure

To a stirred solution of (R)-2-tert-butyl-1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-5-nitro-1H-indole (1.0 g, 3.0 mmol) in ethanol (20 mL) and water (5 mL) was added ammonium formate (0.76 g, 12 mmol) followed by slow addition of 10% palladium on carbon (0.4 g). The mixture was stirred at room temperature for 1 h. The reaction mixture was filtered through a plug of celite and rinsed with ethyl acetate. The filtrate was evaporated under reduced pressure and the crude product was dissolved in ethyl acetate. The organic layer was washed with water (2×5 mL) and brine (2×5 mL). The organic layer was dried over Na2SO4, filtered and evaporated under reduced pressure to give (R)-2-tert-butyl-1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl-1H-indol-5-amine (0.89 g, 98%). 1H NMR (400 MHz, CDCl3) δ 7.04 (d, J=4 Hz, 1H), 6.70 (d, J=2.2 Hz, 1H), 6.48 (dd, J=2.2, 8.6 Hz, 1H), 6.05 (s, 1H), 4.38-4.1 (m, 2H), 4.21 (dd, J=7.5, 16.5 Hz, 1H), 3.87 (dd, J=6.0, 8.6 Hz, 1H), 3.66 (dd, J=6.0, 8.6 Hz, 1H), 3.33 (br s, 2H), 1.40 (s, 3H), 1.34 (s, 9H), 1.25 (s, 3H).

Workup

  1. filtrationThe reaction mixture was filtered through a plug of celite
  2. washrinsed with ethyl acetate
  3. customThe filtrate was evaporated under reduced pressure
  4. dissolutionthe crude product was dissolved in ethyl acetate
  5. washThe organic layer was washed with water (2×5 mL) and brine (2×5 mL)
  6. dry with materialThe organic layer was dried over Na2SO4
  7. filtrationfiltered
  8. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-cd9220292c9a4b8cbfd63506af226e7f
Source dataset
uspto-grants-2010_01
Patent number
US07645789B2

Reaction notes

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