Cyclopentanol → cyclopentyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate

HRID 1154451Notes

Reaction equation

HRID 1154451 reaction equation
[Cl:1][C:2]1[C:7]2[C:8](=[O:24])[N:9]3[CH2:23][CH2:22][CH2:21][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]([O:18][CH2:19][CH3:20])=[O:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1.[C-]#N.[K+].[CH:28]1(O)[CH2:32]CC[CH2:29]1>>[Cl:1][C:2]1[C:7]2[C:8](=[O:24])[N:9]3[CH2:23][CH2:22][CH2:21][C@H:10]3[C:11]3[N:12]([CH:13]=[N:14][C:15]=3[C:16]([O:18][CH:19]3[CH2:32][CH2:28][CH2:29][CH2:20]3)=[O:17])[C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 3

HCID 7298CyclopentanolHCID 9032Potassium CyanideHCID 53890667ethyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]-benzodiazepine-1-carboxylate

Product 1

HCID 54221556cyclopentyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate

Procedure

3.45 g (10 mmol) of ethyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate and 70 mg of powdered potassium cyanide in 10 ml of cyclopentanol are stirred at the boiling point overnight, the excess cyclopentanol is removed in vacuo, the residue is taken up in chloroform, filtered and evaporated. By recrystallization from ethyl acetate/hexane there is obtained cyclopentyl (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate of melting point 210.5°-212°.

Workup

  1. customthe excess cyclopentanol is removed in vacuo
  2. filtrationfiltered
  3. customevaporated
  4. customBy recrystallization from ethyl acetate/hexane there

Sources & evidence

ORD record
ord-f5b6bfedb0ad49c798a790cf7b0d87fe
Source dataset
uspto-grants-1984_12
Patent number
US04489003

Reaction notes

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