Phosgene → 2-isocyanato-5-[3-(2-methoxy-phenyl)-1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]-N,N-dimethyl-benzamide

HRID 901569Notes

Reaction equation

HRID 901569 reaction equation
[NH2:1][C:2]1[CH:12]=[CH:11][C:10]([C:13]2[CH:14]=[C:15]3[C:21]([C:22]4[CH:27]=[CH:26][CH:25]=[CH:24][C:23]=4[O:28][CH3:29])=[CH:20][N:19]([S:30]([C:33]4[CH:38]=[CH:37][C:36]([CH3:39])=[CH:35][CH:34]=4)(=[O:32])=[O:31])[C:16]3=[N:17][CH:18]=2)=[CH:9][C:3]=1[C:4]([N:6]([CH3:8])[CH3:7])=[O:5].[C:40]([O-])(O)=[O:41].[Na+].C(Cl)(Cl)=O>C(Cl)Cl>[N:1]([C:2]1[CH:12]=[CH:11][C:10]([C:13]2[CH:14]=[C:15]3[C:21]([C:22]4[CH:27]=[CH:26][CH:25]=[CH:24][C:23]=4[O:28][CH3:29])=[CH:20][N:19]([S:30]([C:33]4[CH:38]=[CH:37][C:36]([CH3:39])=[CH:35][CH:34]=4)(=[O:31])=[O:32])[C:16]3=[N:17][CH:18]=2)=[CH:9][C:3]=1[C:4]([N:6]([CH3:7])[CH3:8])=[O:5])=[C:40]=[O:41]

Participants

5

Reactant 3

HCID 6371PhosgeneHCID 516892Sodium BicarbonateHCID 597001802-amino-5-[3-(2-methoxy-phenyl)-1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]-N,N-dimethyl-benzamide

Product 1

HCID 597002582-isocyanato-5-[3-(2-methoxy-phenyl)-1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]-N,N-dimethyl-benzamide

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Into a 50 mL round bottomed flask were added 2-amino-5-[3-(2-methoxy-phenyl)-1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]-N,N-dimethyl-benzamide (500 mg, 0.926 mmol), methylene chloride (10 mL) and sat'd NaHCO3(10 mL). The solution was cooled in an ice-water bath for 5 min then phosgene (2.5 mL, 20% w/w solution in toluene, Fluka) was added to the lower (organic) layer. The solution was stirred rapidly and the ice-bath was removed. The reaction mixture was stirred rapidly for 1 h, then the layers were separated and the aqueous phase was extracted 2× with methylene chloride. The combined organic fraction was treated with NaSO4, filtered and concentrated. The residue was triturated with anhydrous ether to give a light yellow/tan powder, which was used directly in the next step. Note: treatment of a small aliquot of the title compound with excess dimethylamine (2M, THF) followed by HPLC analysis provided evidence of isocyanate formation via transformation to the corresponding N,N-dimethyl urea; m/z=612.2 (M+H+).

Workup

  1. temperatureThe solution was cooled in an ice-water bath for 5 min
  2. customthe ice-bath was removed
  3. stirringThe reaction mixture was stirred rapidly for 1 h
  4. customthe layers were separated
  5. extractionthe aqueous phase was extracted 2× with methylene chloride
  6. additionThe combined organic fraction was treated with NaSO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was triturated with anhydrous ether
  10. customto give a light yellow/tan powder, which

Sources & evidence

ORD record
ord-8e100d027367472a8e307527d5482393
Source dataset
uspto-grants-2008_04
Patent number
US07361764B2

Reaction notes

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