Hydrochloric Acid → HCID 20385596, compound

HRID 1833665Notes

Reaction equation

HRID 1833665 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][CH:9]2[CH2:14][CH2:13][N:12]([CH2:15][CH2:16][CH2:17][N:18]3[C:22]4[CH:23]=[CH:24][CH:25]=[CH:26][C:21]=4[N:20](C(C)=C)[C:19]3=[O:30])[CH2:11][CH2:10]2)=[C:4]([N+:31]([O-:33])=[O:32])[CH:3]=1.CC1C=CC=CC=1.Cl>CC(O)C>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][CH:9]2[CH2:10][CH2:11][N:12]([CH2:15][CH2:16][CH2:17][N:18]3[C:22]4[CH:23]=[CH:24][CH:25]=[CH:26][C:21]=4[NH:20][C:19]3=[O:30])[CH2:13][CH2:14]2)=[C:4]([N+:31]([O-:33])=[O:32])[CH:3]=1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 1140TolueneHCID 203856271-[3-{4-[(4-chloro-2-nitrophenyl)amino]-1-piperidinyl}propyl]-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one

Product 1

HCID 20385596HCID 20385596, compoundYield 75.5%

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

A solution of 98.5 parts of 1-[3-{4-[(4-chloro-2-nitrophenyl)amino]-1-piperidinyl}propyl]-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one in 360 parts of methylbenzene is acidfied with 2-propanol, previously saturated with gaseous hydrogen chloride. After boiling for a while, an oil precipitates. The supernatant phase is decanted and the residual oil is suspended in water. The suspension is alkalized with a concentrated ammonium hydroxide solution. The product is extracted with methylbenzene. The extract is dried, filtered and evaporated. The residue is crystallized from 4-methyl-2-pentanone. The product is filtered off and dried, yielding 68 parts (75.5%) of 1-[3-{4-[(4-chloro-2-nitrophenyl)amino]-1-piperidinyl}-propyl]-1,3-dihydro-2H-benzimidazol-2-one. A mixture of 21.5 parts of 1-]3-{4-[(4-chloro-2-nitrophenyl)-amino]-1-piperidinyl}propyl]-1,3-dihydro-2H-benzimidazol-2-one and 240 parts of methanol is hydrogenated at normal pressure and at room temperature with 5 parts of Raney-nickel catalyst. After the calculated amount of hydrogen is taken up, the catalyst is filtered off and the filtrate is evaporated, yielding 20 parts (100%) of 1-[3-{4-[(2-amino-4chlorophenyl)amino]-1-piperidinyl}propyl]-1,3-dihydro-2H-benzimidazol-2-one as a residue.

Workup

  1. customan oil precipitates
  2. customThe supernatant phase is decanted
  3. extractionThe product is extracted with methylbenzene
  4. customThe extract is dried
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue is crystallized from 4-methyl-2-pentanone
  8. filtrationThe product is filtered off
  9. customdried

Sources & evidence

ORD record
ord-56fa339e898e40ac9da7bfc3c407fdc1
Source dataset
uspto-grants-1978_01
Patent number
US04066772

Reaction notes

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