4-Methylmorpholine → tert-Butyl 4-[(2E)-4-methoxy-4-oxobut-2-en-1-yl]piperidine-1-carboxylate

HRID 650658Notes

Reaction equation

HRID 650658 reaction equation
C(Cl)(=O)C(Cl)=O.[C:7]([N:14]1[CH2:19][CH2:18][CH:17]([CH2:20][CH2:21]O)[CH2:16][CH2:15]1)([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8].CN1CCOCC1.[CH3:30][O:31][C:32]([CH:34]=P(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)=[O:33]>C(Cl)Cl.CS(C)=O>[C:7]([N:14]1[CH2:15][CH2:16][CH:17]([CH2:20]/[CH:21]=[CH:34]/[C:32]([O:31][CH3:30])=[O:33])[CH2:18][CH2:19]1)([O:9][C:10]([CH3:11])([CH3:12])[CH3:13])=[O:8]

Participants

7

Reactant 4

HCID 79724-MethylmorpholineHCID 17453Acetic acid, 2-(triphenylphosphoranylidene)-, methyl esterHCID 65578Oxalyl chlorideHCID 8541401-(tert-Butoxycarbonyl)-4-(2-hydroxyethyl)piperidine

Product 1

HCID 10446560tert-Butyl 4-[(2E)-4-methoxy-4-oxobut-2-en-1-yl]piperidine-1-carboxylate

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 6344DichloromethaneSolvent2×

Conditions

Temperature
-78 °C

Procedure

A solution of oxalyl chloride (11.8 g) in methylene chloride (180 ml) is cooled to −78° C. and dimethyl sulfoxide (DMSO) (8.9 ml) is added dropwise. The solution is stirred at −78° C. for about 3 minutes and a solution of N-BOC-2-(piperidin-4-yl)ethanol (14.3 g) in methylene chloride (250 ml) is added over a period of about 10 minutes. The solution is stirred for about 1 hour and N-methyl morpholine (21.6 g) is added over a period of about 15 minutes. The solution is allowed to warm to room temperature and, after about 30 minutes, methyl (triphenylphosphoranylidene) acetate (68.6 g) is added. The solution is stirred at room temperature for about 18 hours, evaporated in vacuo and the residue taken up in ethyl acetate. The ethyl acetate solution is washed with water, 5% HCl, 5% sodium hypochlorite solution, water, brine, dried over sodium sulfate, filtered and evaporated in vacuo to give methyl 4-(N-BOC-piperidin-4-yl)trans-crotonate.

Workup

  1. stirringThe solution is stirred for about 1 hour
  2. temperatureto warm to room temperature and, after about 30 minutes
  3. stirringThe solution is stirred at room temperature for about 18 hours
  4. customevaporated in vacuo
  5. washThe ethyl acetate solution is washed with water, 5% HCl, 5% sodium hypochlorite solution, water, brine
  6. dry with materialdried over sodium sulfate
  7. filtrationfiltered
  8. customevaporated in vacuo

Sources & evidence

ORD record
ord-5077ae63f0b24a1f893c35e0329750d0
Source dataset
uspto-grants-2001_08
Patent number
US06274705B1

Reaction notes

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