2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 8-Chloro-2-methyl-6-phenyl-4H-pyrazolo[1,5-a][1,4]benzodiazepine

HRID 262343Notes

Reaction equation

HRID 262343 reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]3[N:12]=[C:13]([CH3:15])[CH:14]=[C:10]3[C:9](=O)[NH:8][CH:7]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:6]=2[CH:23]=1.C(C1C(=O)C(Cl)=C(Cl)C(=O)C=1C#N)#N>C1COCC1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]3[N:12]=[C:13]([CH3:15])[CH:14]=[C:10]3[CH2:9][N:8]=[C:7]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:6]=2[CH:23]=1

Participants

4

Reactant 2

HCID 67752,3-Dichloro-5,6-dicyano-1,4-benzoquinoneHCID 123778928-Chloro-2-methyl-5,6-dihydro-4-oxo-6-phenyl-4H-pyrazolo[1,5-a][1,4]benzodiazepine

Product 1

HCID 123778938-Chloro-2-methyl-6-phenyl-4H-pyrazolo[1,5-a][1,4]benzodiazepine

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of 2.52 g. (7.8 mmol) of the end product of Example 16 in 75 ml. dry THF was reduced with 3.12 ml. (31.2 mmol) of BMS according to the procedure described above in 6, Method B. The crude product from this reduction was then treated with 2.15 g. (9.4 mmol) of DDQ according to the oxidation procedure described above in Example 8. The crude oxidation product was chromatographed on a 29×20 cm column of silica gel packed in benzene and eluted first with 3% EtOAc in benzene and then 5% EtOAc in benzene. Recrystallization from CH3OH/H2O of the material isolated from the column yielded the analytically pure end product as colorless needles: mp 105°-107°.

Workup

  1. customThe crude oxidation product was chromatographed on a 29×20 cm column of silica gel
  2. washeluted first with 3% EtOAc in benzene
  3. customRecrystallization from CH3OH/H2O of the material
  4. customisolated from the column
  5. customyielded the analytically pure end product as colorless needles

Sources & evidence

ORD record
ord-11a243d4eb954291ab4aa8eba0cc8aed
Source dataset
uspto-grants-1979_05
Patent number
US04153799

Reaction notes

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