Triethylamine → (+)-8-Chloro-6,11-dihydro-11-[4-(4-pyridinylmethyl)-1-piperazinyl]-5h-benzo[5,6]cyclohepta-[1,2-b]pyridine

HRID 21416Notes

Reaction equation

HRID 21416 reaction equation
[CH:1]1[C:6]([CH2:7]O)=[CH:5][CH:4]=[N+:3]([O-])[CH:2]=1.C(Br)(Br)(Br)Br.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[Cl:34][C:35]1[CH:36]=[CH:37][C:38]2[CH:48]([N:49]3[CH2:54][CH2:53][NH:52][CH2:51][CH2:50]3)[C:43]3=[N:44][CH:45]=[CH:46][CH:47]=[C:42]3[CH2:41][CH2:40][C:39]=2[CH:55]=1.C(N(CC)CC)C>C(Cl)Cl>[Cl:34][C:35]1[CH:36]=[CH:37][C:38]2[CH:48]([N:49]3[CH2:50][CH2:51][N:52]([CH2:7][C:6]4[CH:5]=[CH:4][N:3]=[CH:2][CH:1]=4)[CH2:53][CH2:54]3)[C:43]3=[N:44][CH:45]=[CH:46][CH:47]=[C:42]3[CH2:41][CH2:40][C:39]=2[CH:55]=1

Participants

7

Reactant 5

HCID 8471TriethylamineHCID 11205Carbon tetrabromideHCID 11776TriphenylphosphineHCID 896664-Pyridylmethanol N-oxideHCID 5255691HCID 5255691, compound

Product 1

HCID 19933864(+)-8-Chloro-6,11-dihydro-11-[4-(4-pyridinylmethyl)-1-piperazinyl]-5h-benzo[5,6]cyclohepta-[1,2-b]pyridineYield 45.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a mixture of 188 mg (1.50 mmol) of 4-pyridylcarbinol N-oxide and 497 mg (1.50 mmol) of carbon tetrabromide in 12 mL of dry methylene chloride at room temperature and under an argon atmosphere was added in one portion 393 mg (1.50 mmol) of triphenylphosphine. After 40 minutes, 313 mg (0.997 mmol) of (-)-8-chloro-6,11-dihydro-11-(4-piperazinyl)-5H-benzo[5,6]cyclohepta-[1,2-b]pyridine was added followed by 209 mL (1.57 mmol) of triethylamine. The reaction mixture was then allowed to stir at room temperature for 3 hr, after which it was taken up in methylene chloride and washed once with 0.5M aqueous sodium bicarbonate and then brine. The organic portion was dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified via flash chromatography (4% methanol saturated with ammonia in methylene chloride) to provide 183 mg of (-)-8-chloro-6,11-dihydro-11-[4 -(4-pyridinylmethyl)-1-piperazinyl]-5h-benzo[5,6]cyclohepta-[1,2-b]pyridine, N-oxide as a glass: MS (CI) m/z 421 (M+ +1);

Workup

  1. washwashed once with 0.5M aqueous sodium bicarbonate
  2. dry with materialThe organic portion was dried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified via flash chromatography (4% methanol saturated with ammonia in methylene chloride)

Sources & evidence

ORD record
ord-1ba716dc820347e494732209b62094f7
Source dataset
uspto-grants-1995_06
Patent number
US05422351

Reaction notes

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