Hydrochloric Acid → (Z)-4-azido-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one

HRID 324961Notes

Reaction equation

HRID 324961 reaction equation
F[C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[C:7]2[C:3]=1/[C:4](=[CH:15]/[C:16]1[NH:17][CH:18]=[CH:19][C:20]=1[O:21][CH3:22])/[C:5](=[O:14])[NH:6]2.C(N(C(C)C)CC)(C)C.C[Si]([N:36]=[N+:37]=[N-:38])(C)C.Cl>C1COCC1.C(O)C>[N:36]([C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[C:7]2[C:3]=1/[C:4](=[CH:15]/[C:16]1[NH:17][CH:18]=[CH:19][C:20]=1[O:21][CH3:22])/[C:5](=[O:14])[NH:6]2)=[N+:37]=[N-:38]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 78378AzidotrimethylsilaneHCID 81531DiisopropylethylamineHCID 15512601(Z)-1,3-Dihydro4-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one2×

Product 1

HCID 15512602(Z)-4-azido-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

(Z)-1,3-Dihydro4-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one (6.60 g, 21.8 mmol) (Starting Material 3 above) was suspended in 330 mL of THF and 165 mL of ethanol. To this mixture was added diisopropylethylamine (56.9 ml, 326 mmol) (Aldrich) and trimethylsilyl azide (28.6 mL, 218 mmol) (Aldrich). The reaction mixture was heated at reflux overnight, and then poured into 2 L mixture of ice and 1 N HCl solution. The solid precipitate was filtered, washed with water and dried at 50° C. under high vacuum to give (Z)4-azido-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one as a dark red solid. (Yield 6.44 g, 90%)

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureat reflux overnight
  3. filtrationThe solid precipitate was filtered
  4. washwashed with water
  5. customdried at 50° C. under high vacuum

Sources & evidence

ORD record
ord-d1d8a156fd55474bbc1d18874cfc8f4e
Source dataset
uspto-grants-2001_04
Patent number
US06221867B1

Reaction notes

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