Water → 2,6-Bis(2-methoxyphenyl)-1-methyl-4-piperidone

HRID 77687Notes

Reaction equation

HRID 77687 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[CH:9]=[CH:10][C:11](=[O:22])[CH:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[O:20][CH3:21].[CH3:23][NH2:24].O>CN(C)C=O>[CH3:21][O:20][C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=1[CH:13]1[CH2:12][C:11](=[O:22])[CH2:10][CH:9]([C:4]2[CH:5]=[CH:6][CH:7]=[CH:8][C:3]=2[O:2][CH3:1])[N:24]1[CH3:23]

Participants

5

Reactant 3

HCID 962WaterHCID 6329MethylamineHCID 263454HCID 263454, compound

Product 1

HCID 695017602,6-Bis(2-methoxyphenyl)-1-methyl-4-piperidoneYield 55%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

1,5-Bis(2-methoxyphenyl)-1,4-pentadien-3-one (20c, 0.26 g, 0.9 mmol) was dissolved in dimethyl formamide (5 ml). Methylamine (51, 0.40 ml, 4.6 mmol, 40% in water) was added and the mixture stirred for 24 hr at room temperature. The mixture was poured into water (50 ml) and stirred for 24 hr at room temperature. The resulting mixture was extracted into ethyl acetate, washed with saturated sodium chloride, dried over magnesium sulfate, filtered and evaporated to afford a solid. The solid was recrystallized twice from ethanol to give 0.16 g (55%) of a white solid: mp 146-148° C.; 1H NMR δ 1.89 (s, 3H), 2.50 (d, 2H, J=13.7 Hz), 2.65 (t, 2H, J=11.9 Hz), 3.82 (s, 6H), 4.11 (d, 2H, J=11.5 Hz), 6.87 (d, 2H, J=8.3 Hz), 7.03 (t, 2H, J=7.2 Hz), 7.23 (t, 2H, J=5.8 Hz), 7.72 (d, 2H, J=7.6 Hz); 13C NMR: δ 40.3, 49.2, 55.4, 61.2, 110.7, 121.0, 127.6, 127.8, 131.5, 156.3, 208.1; Exact mass calcd for C20H23NO3: 325.1678, observed (M+H) 326.1754.

Workup

  1. stirringstirred for 24 hr at room temperature
  2. extractionThe resulting mixture was extracted into ethyl acetate
  3. washwashed with saturated sodium chloride
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. customevaporated
  7. customto afford a solid
  8. customThe solid was recrystallized twice from ethanol

Sources & evidence

ORD record
ord-87b1ec88755c4211a2edd069db70a281
Source dataset
uspto-grants-2014_09
Patent number
US08841326B2

Reaction notes

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