Acetaldehyde → Methyl 3-{[(2R*,6R*)-1-benzyl-2,6-dimethylpiperidin-4-yl](ethyl)amino}-2-methyl-5-(trifluoromethyl)benzoate

HRID 2208672Notes

Reaction equation

HRID 2208672 reaction equation
[CH2:1]([N:8]1[C@H:13]([CH3:14])[CH2:12][CH:11]([NH:15][C:16]2[C:17]([CH3:30])=[C:18]([CH:23]=[C:24]([C:26]([F:29])([F:28])[F:27])[CH:25]=2)[C:19]([O:21][CH3:22])=[O:20])[CH2:10][C@H:9]1[CH3:31])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH:32](=O)[CH3:33].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl.CC(O)=O>[CH2:1]([N:8]1[C@H:13]([CH3:14])[CH2:12][CH:11]([N:15]([CH2:32][CH3:33])[C:16]2[C:17]([CH3:30])=[C:18]([CH:23]=[C:24]([C:26]([F:29])([F:27])[F:28])[CH:25]=2)[C:19]([O:21][CH3:22])=[O:20])[CH2:10][C@H:9]1[CH3:31])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 177AcetaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 86719532Methyl 3-{[(2R*,6R*)-1-benzyl-2,6-dimethylpiperidin-4-yl]amino}-2-methyl-5-(trifluoromethyl)benzoate

Product 1

HCID 70873570Methyl 3-{[(2R*,6R*)-1-benzyl-2,6-dimethylpiperidin-4-yl](ethyl)amino}-2-methyl-5-(trifluoromethyl)benzoateYield 80%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
23 °C

Procedure

To a stirred solution of methyl 3-{[(2R,6R)-1-benzyl-2,6-dimethylpiperidin-4-yl]amino}-2-methyl-5-(trifluoromethyl)benzoate (278 mg, 0.640 mmol) in CH2Cl2 (5 mL) and AcOH (500 uL) was added acetaldehyde (359 mg, 6.40 mmol) and sodium triacetoxyborohydride (428 mg, 1.92 mmol) at 0° C. The reaction mixture was stirred at 23° C. for 7 hours. Then the reaction mixture was quenched with aq. NaHCO3 until pH8-9. The content was extracted with ethylacetate, dried over MgSO4 and filtered. The filtrate was concentrated in vacuo. The residue was purified by silica gel column chromatography (NH—SiO2; heptane/ethylacetate=5/1) to give the titled compound as a light yellow oil (236 mg, 80% yield.). 1H-NMR (400 MHz, CDCl3) δppm; 7.79 (s, 1H), 7.43 (s, 1H), 7.21-7.36 (m, 5H), 3.92 (s, 3H), 3.87 (d, J=14.0 Hz, 1H), 3.38 (d, J=14.0 Hz, 1H), 3.04-3.15 (m, 4H), 2.73-2.80 (m, 1H), 2.53 (s, 3H), 1.76-1.82 (m, 1H), 1.51-1.63 (m, 2H), 1.34-1.42 (m, 1H), 1.06 (d, J=6.0 Hz, 3H), 0.93 (d, J=6.8 Hz, 3H), 0.86 (t, J=6.8 Hz, 3H).

Workup

  1. customThen the reaction mixture was quenched with aq. NaHCO3 until pH8-9
  2. extractionThe content was extracted with ethylacetate
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. concentrationThe filtrate was concentrated in vacuo
  6. customThe residue was purified by silica gel column chromatography (NH—SiO2; heptane/ethylacetate=5/1)

Sources & evidence

ORD record
ord-bdf43db96fcc4a19976877477da5a533
Source dataset
uspto-grants-2016_06
Patent number
US09376422B2

Reaction notes

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