(S)-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-7-nitro-2H-1,4-benzodiazepin-2-one → (S)-7-amino-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-2H-1,4-benzodiazepin-2-one

HRID 1632170Notes

Reaction equation

HRID 1632170 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:14]2[CH:15]=[C:16]([N+:19]([O-])=O)[CH:17]=[CH:18][C:13]=2[N:12]([CH3:22])[C:11](=[O:23])[C@H:10]([CH3:24])[N:9]=1>O1CCCC1.CO.[Ni]>[NH2:19][C:16]1[CH:17]=[CH:18][C:13]2[N:12]([CH3:22])[C:11](=[O:23])[C@H:10]([CH3:24])[N:9]=[C:8]([C:3]3[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=3[Cl:1])[C:14]=2[CH:15]=1

Participants

5

Reactant 1

HCID 54101851(S)-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-7-nitro-2H-1,4-benzodiazepin-2-one

Product 1

HCID 54176638(S)-7-amino-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-2H-1,4-benzodiazepin-2-one

Reagents, catalysts & solvents 3

HCID 935NickelCatalystHCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

A solution of 68.2 g (0.198 mol) of (S)-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-7-nitro-2H-1,4-benzodiazepin-2-one in a mixture of 400 ml of tetrahydrofuran and 950 ml of methanol is treated with Raney-nickel which has previously been washed several times with methanol and tetrahydrofuran and the suspension is hydrogenated while stirring and cooling with water, whereupon it is filtered and the filtrate is evaporated. The residue is recrystallized from ether, there being obtained (S)-7-amino-5-(o-chlorophenyl)-1,3-dihydro-1,3-dimethyl-2H-1,4-benzodiazepin-2-one of melting point 221°; [α]25D =-13.8° (1 percent solution in methylene chloride).

Workup

  1. washhas previously been washed several times with methanol and tetrahydrofuran
  2. temperaturecooling with water, whereupon it
  3. filtrationis filtered
  4. customthe filtrate is evaporated
  5. customThe residue is recrystallized from ether, there

Sources & evidence

ORD record
ord-75da06589c894bfcb93df647a530ff2c
Source dataset
uspto-grants-1984_10
Patent number
US04474777

Reaction notes

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