Acetic Acid → (S)-8-chloro-11,12,13,13a-tetrahydro-1-(3-propyl-1,2,4-oxadiazol-5-yl)-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]-benzodiazepin-9-one

HRID 867548Notes

Reaction equation

HRID 867548 reaction equation
[Cl:1][C:2]1[C:7]2[C:8](=[O:26])[N:9]3[CH2:25][CH2:24][CH2:23][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]([N:18]3C=C[N:20]=[CH:19]3)=[O:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1.[C:27](=NO)(N)[CH2:28][CH2:29]C.C(O)(=O)C>CN(C)C=O>[Cl:1][C:2]1[C:7]2[C:8](=[O:26])[N:9]3[CH2:25][CH2:24][CH2:23][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]3[O:17][N:20]=[C:19]([CH2:27][CH2:28][CH3:29])[N:18]=3)[C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 176Acetic AcidHCID 2794811N-HydroxybutyramidineHCID 54332091(S)-1-[(8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-1-yl)carbonyl]imidazole

Product 1

HCID 22840045(S)-8-chloro-11,12,13,13a-tetrahydro-1-(3-propyl-1,2,4-oxadiazol-5-yl)-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]-benzodiazepin-9-one

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

41.20 g (112.1 mmol) of 1-[[(S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-1-yl]carbonyl]imidazole and 12.6 g (123.4 mmol) of butyramidoxime are stirred at 60° for 2.5 hours in 200 ml of N,N-dimethylformamide. The cooled suspension is then filtered; the filter residue is rinsed with ether and dried. The product obtained is stirred at 1120° for 3 hours with 350 ml of glacial acetic acid. The reaction mixture is evaporated and the residue is dissolved in methylene chloride. The solution is washed with a saturated sodium bicarbonate solution, dried over magnesium sulphate and evaporated. By recrystallization of the residue from methylene chloride and ethyl acetate there is obtained (S)-8-chloro-11,12,13,13a-tetrahydro-1-(3-propyl-1,2,4-oxadiazol-5-yl)-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]-benzodiazepin-9-one of melting point 176°-178°.

Workup

  1. filtrationThe cooled suspension is then filtered
  2. washthe filter residue is rinsed with ether
  3. customdried
  4. customThe product obtained
  5. customThe reaction mixture is evaporated
  6. dissolutionthe residue is dissolved in methylene chloride
  7. washThe solution is washed with a saturated sodium bicarbonate solution
  8. dry with materialdried over magnesium sulphate
  9. customevaporated
  10. customBy recrystallization of the residue from methylene chloride and ethyl acetate

Sources & evidence

ORD record
ord-69a256dd10f243e39d4998208bbcd469
Source dataset
uspto-grants-1988_10
Patent number
US04775671

Reaction notes

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