Methanol → 4,4-Dimethoxy-2-[(4-methoxyphenyl)methyl]-1,3,3-trimethylpiperidine

HRID 2295507Notes

Reaction equation

HRID 2295507 reaction equation
B(F)(F)F.C[CH2:6][O:7]CC.[CH3:10][O:11][C:12]1[CH:28]=[CH:27][C:15]([CH2:16][CH:17]2[C:22]([CH3:24])([CH3:23])[C:21](=[O:25])[CH2:20][CH2:19][N:18]2[CH3:26])=[CH:14][CH:13]=1.[OH-].[Na+].[CH3:31]O>>[CH3:31][O:25][C:21]1([O:7][CH3:6])[CH2:20][CH2:19][N:18]([CH3:26])[CH:17]([CH2:16][C:15]2[CH:14]=[CH:13][C:12]([O:11][CH3:10])=[CH:28][CH:27]=2)[C:22]1([CH3:24])[CH3:23]

Participants

5

Reactant 4

HCID 887MethanolHCID 8000Boron trifluoride etherateHCID 14798Sodium HydroxideHCID 167261392-[(4-Methoxyphenyl)methyl]-1,3,3-trimethylpiperidin-4-one

Product 1

HCID 204746834,4-Dimethoxy-2-[(4-methoxyphenyl)methyl]-1,3,3-trimethylpiperidine

Procedure

40 ml of borontrifluoride etherate are added drop-wise over 20 minutes and with stirring to a solution of 52.2 g (0.2 Mol) 2-(4-methoxybenzyl)-1,3,3-trimethyl-4-piperidone in 500 ml methanol, the temperature being maintained below 35° C. After stirring for 16 hours at room-temperature 40 g pulverized sodium hydroxide are added. After stirring for a further 30 minutes the obtained sodium salts are filtered off and washed with methanol. The filtrate is evaporated under reduced pressure and after addition of 500 ml water, extracted 3 times with 150 ml of chloroform. The chloroform phases are dried over sodium sulphate and evaporated under reduced pressure. After crystallization from 200 ml petrol ether (b.p.: 60°-80° C.) and further recrystallization there are obtained 25.4 g 4,4-dimethoxy-2-(4-methoxybenzyl)-1,3,3-trimethylpiperidine, m.p.: 91°-92.5° C.

Workup

  1. temperaturethe temperature being maintained below 35° C
  2. additionare added
  3. filtrationare filtered off
  4. washwashed with methanol
  5. customThe filtrate is evaporated under reduced pressure
  6. additionafter addition of 500 ml water
  7. extractionextracted 3 times with 150 ml of chloroform
  8. dry with materialThe chloroform phases are dried over sodium sulphate
  9. customevaporated under reduced pressure
  10. customAfter crystallization
  11. customfrom 200 ml petrol ether (b.p.: 60°-80° C.) and further recrystallization there

Sources & evidence

ORD record
ord-e6d8215dde694a19a8909a5e2cdf4a83
Source dataset
uspto-grants-1984_01
Patent number
US04425353

Reaction notes

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