Pyridine → HCID 4202153, compound

HRID 346777Notes

Reaction equation

HRID 346777 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([S:8](Cl)(=[O:10])=[O:9])=[CH:4][C:3]=1[N+:12]([O-:14])=[O:13].[Cl:15][C:16]1[CH:17]=[C:18]([CH:20]=[CH:21][CH:22]=1)[NH2:19].N1C=CC=CC=1>C(Cl)Cl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:19][C:18]2[CH:20]=[CH:21][CH:22]=[C:16]([Cl:15])[CH:17]=2)(=[O:10])=[O:9])=[CH:4][C:3]=1[N+:12]([O-:14])=[O:13]

Participants

5

Reactant 3

HCID 1049PyridineHCID 7323Benzenesulfonyl chloride, 4-chloro-3-nitro-HCID 79323-Chloroaniline

Product 1

HCID 4202153HCID 4202153, compound

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 4-chloro-3-nitrobenzenesulfonylchloride (1 g, 3.9 mmol), 3-chloroaniline (0.5 mL, 4.7 mmol) and pyridine (1.6 mL) in CH2Cl2 (2 mL) was stirred at room temperature. The reaction was quenched with NaHCO3 (sat aq solution, 30 mL×3). The organic phase was separated, dried (MgSO4), and filtered. The volatiles were evaporated and the residue was purified by column chromatography (SiO2, pentane:EtOAc, 4:1) to give 4-chloro-N-(3-chlorophenyl)-3-nitrobenzenesulfonamide; MS (posESI) m/z=349.2 (M+H+). 1H NMR (CDCl3) δ 7.00–7.40 (m, 3H), 7.60–7.90 (m, 3H), 8.70 (bs, 1H). 4-Chloro-N-(3-chlorophenyl)-3-nitrobenzenesulfonamide (0.45 g, 1.3 mmol), N-methylpiperazine (0.191 mL, 1.73 mmol) and K2CO3 (359 mg, 2.6 mmol) in CH3CN (2.5 mL) as the filtrated was concentrated to give a residue which was purified by column (SiO2, CHCl3:MeOH:NH3 9:1:0.4%) to give 420 mg of N-(3-chlorophenyl)-4-(4-methyl-1-piperazinyl)-3-nitrobenzenesulfonamide (85%). Purity>95% according to HPLC analysis. The compound was dissolved in THF (1 mL) and ethanol (5 mL) was added. The solution was treated with Raney-Ni (50 mg) and hydrazine monohydrate (0.05 mL) overnight. The Raney-Ni was filtered (celite pad), the volatiles were evaporated and the residue was purified by column chromatography (SiO2, CHCl3:MeOH:NH3 9:1:0.4%). The product was isolated as hydrochloride salt by treatment with HCl gas in diethyl ether to yield 170 mg of final product (32%).

Workup

  1. customThe reaction was quenched with NaHCO3 (sat aq solution, 30 mL×3)
  2. customThe organic phase was separated
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. customThe volatiles were evaporated
  6. customthe residue was purified by column chromatography (SiO2, pentane:EtOAc, 4:1)

Sources & evidence

ORD record
ord-4560ee7130a647639f3086a08b8c2470
Source dataset
uspto-grants-2007_02
Patent number
US07173035B2

Reaction notes

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