4-Toluenesulfonyl chloride → HCID 178427792, compound

HRID 1793188Notes

Reaction equation

HRID 1793188 reaction equation
[N+:1]([C:4]1[N:5]=[CH:6][N:7]([CH:9]2[CH2:12][CH:11]([OH:13])[CH2:10]2)[CH:8]=1)([O-:3])=[O:2].CCN(CC)CC.[C:21]1([CH3:31])[CH:26]=[CH:25][C:24]([S:27](Cl)(=[O:29])=[O:28])=[CH:23][CH:22]=1>C(Cl)Cl>[N+:1]([C:4]1[N:5]=[CH:6][N:7]([C@H:9]2[CH2:10][C@H:11]([O:13][S:27]([C:24]3[CH:25]=[CH:26][C:21]([CH3:31])=[CH:22][CH:23]=3)(=[O:29])=[O:28])[CH2:12]2)[CH:8]=1)([O-:3])=[O:2]

Participants

5

Reactant 3

HCID 73974-Toluenesulfonyl chlorideHCID 8471TriethylamineHCID 220259763-(4-Nitro-1H-imidazol-1-yl)cyclobutan-1-ol

Product 1

HCID 178427792HCID 178427792, compoundYield 37%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

3-(4-nitro-imidazol-1-yl)-cyclobutanol (Preparation 4, Step 1; 4 g, 22 mmol) was treated with Et3N (7.7 mL, 55 mmol) in methylene chloride (150 mL) followed by p-toluenesulfonyl chloride (TsCl) (5 g, 26.4 mmol) and 4-N,N-dimethylaminopyridine (DMAP) (268 mg, 2.2 mmol). The resulting mixture was stirred at room temperature for 24 h. Analysis by thin layer chromatography showed two new spots. The reaction mixture was diluted with methylene chloride and was washed with water (1×) and brine (1×). The organic layer was dried (MgSO4), filtered, and concentrated in vacuo. Purification by silica gel chromatography (1:1 to 2:1 hexanes-ethyl acetate) allowed for separation of the trans and cis diastereomers. The first spot to elute (high Rf) was the trans-isomer, trans-toluene-4-sulfonic acid 3-(4-nitro-imidazol-1-yl)-cyclobutyl ester (2.7 g, 37% yield); 1H NMR (400 MHz, CDCl3) δ 7.79 (s, 1H), 7.77 (m, 2H), 7.44 (d, J=1.7 Hz, 1H), 7.36 (dd, J=0.5, 8.0 Hz, 2H), 5.034 (m, 1H), 4.94 (m, 1H), 2.9 (m, 2H), 2.7 (m, 2H); MS (AP/CI): 338.1 (M+H)+. The second spot to elute was the cis-isomer, cis-toluene-4-sulfonic acid 3-(4-nitro-imidazol-1-yl)-cyclobutyl ester (2.9 g, 39% yield); 1H NMR (400 MHz, CDCl3) δ 7.8 (m, 3H), 7.43 (d, J=1.4 Hz, 1H), 7.36 (dd, J=0.6, 8.5 Hz, 2H), 4.74 (m, 1H), 4.30 (m, 1H), 3.05 (m, 2H), 2.6–2.5 (m, 2H), 2.45 (s, 3H); MS (AP/CI): 338.1 (M+H)+. Relative configurations were determined by the measurement of nuclear Overhauser effects.

Workup

  1. washwas washed with water (1×) and brine (1×)
  2. dry with materialThe organic layer was dried (MgSO4)
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customPurification by silica gel chromatography (1:1 to 2:1 hexanes-ethyl acetate)
  6. customallowed for separation of the trans and cis diastereomers
  7. washThe first spot to elute (high Rf)

Sources & evidence

ORD record
ord-496b10fd4f3f4c06b178e187ca96e743
Source dataset
uspto-grants-2006_07
Patent number
US07078529B2

Reaction notes

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