Hydrochloric Acid → N-{2-[4-(2,3-Dihydro-1,4-benzodioxin-5-yl)piperazin-1-yl]propyl}pyridin-2-amine

HRID 51207Notes

Reaction equation

HRID 51207 reaction equation
C(OC(=O)[N:7]([CH2:14][CH:15]([N:17]1[CH2:22][CH2:21][N:20]([C:23]2[C:32]3[O:31][CH2:30][CH2:29][O:28][C:27]=3[CH:26]=[CH:25][CH:24]=2)[CH2:19][CH2:18]1)[CH3:16])[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][N:9]=1)(C)(C)C.Cl>C(O)C>[O:28]1[C:27]2[CH:26]=[CH:25][CH:24]=[C:23]([N:20]3[CH2:21][CH2:22][N:17]([CH:15]([CH3:16])[CH2:14][NH:7][C:8]4[CH:13]=[CH:12][CH:11]=[CH:10][N:9]=4)[CH2:18][CH2:19]3)[C:32]=2[O:31][CH2:30][CH2:29]1

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 10288411{2-[4-(2,3-Dihydro-benzo[1,4]dioxin-5-yl)-piperazin-1-yl]-propyl}-pyridin-2-yl-carbamic acid tert-butyl ester

Product 1

HCID 12991319N-{2-[4-(2,3-Dihydro-1,4-benzodioxin-5-yl)piperazin-1-yl]propyl}pyridin-2-amineYield 49%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent2×

Procedure

Compound VII as a crude oil (49.0 g, 0.106 mol) is dissolved in ethanol (150 mL) and to this solution is added 1N HCl solution in ethanol (212 mL). The resulting solution is refluxed for 18 h, then concentrated in vacuum to a small volume (˜100 mL) until product starts to crystallize. Ether (100 mL) is added slowly to resulting slurry, in portions, and the mixture is stirred at ambient temperature for 2 h. Slightly gray crystals are filtered and washed with ethanol/ether (50:50) mixture to afford 22.2 g of compound VIII (49% over 3 steps). The purity is determined to be 97.9% by LC-MS. This batch is then recrystallized from methanol (150 mL) and ether (200 mL) to produce 19.3 g of VIII with 99% purity. 1H NMR (CD3OD) δ8.01 (m, 2H), 7.30 (d, J=9 Hz, 1H), 7.08 (t, J=7.4 Hz, 1H), 6.82 (t, J=8.1 Hz, 1H), 6.63 (m, 2H), 4.30 (m, 4H), 4.10 (m, 1H), 3.80-2.90 (m, 9H), 1.55 (d, J=6.2 Hz, 3H). MP=245-248° C.

Workup

  1. temperatureThe resulting solution is refluxed for 18 h
  2. concentrationconcentrated in vacuum to a small volume (˜100 mL) until product
  3. customto crystallize
  4. additionEther (100 mL) is added slowly
  5. customto resulting slurry
  6. filtrationSlightly gray crystals are filtered
  7. washwashed with ethanol/ether (50:50) mixture

Sources & evidence

ORD record
ord-7250386f0a774381a111269a4ff920d6
Source dataset
uspto-grants-2004_03
Patent number
US06713626B2

Reaction notes

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