Methanol → 4-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1-methyl-1,2,5,6-tetrahydropyridine

HRID 2294070Notes

Reaction equation

HRID 2294070 reaction equation
[CH:1]1[C:11]2[CH2:10][CH2:9][C:8]3[CH:12]=[CH:13][CH:14]=[CH:15][C:7]=3[C:6](=[C:16]3[CH2:21][CH2:20][N:19]([CH3:22])[CH2:18][CH2:17]3)[C:5]=2[CH:4]=[CH:3][CH:2]=1.C([Li])CCC.CO>C1COCC1>[CH:12]1[C:8]2[CH2:9][CH2:10][C:11]3[CH:1]=[CH:2][CH:3]=[CH:4][C:5]=3[CH:6]([C:16]3[CH2:21][CH2:20][N:19]([CH3:22])[CH2:18][CH:17]=3)[C:7]=2[CH:15]=[CH:14][CH:13]=1

Participants

5

Reactant 3

HCID 887MethanolHCID 1688974-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)-1-methylpiperidineHCID 178418339Butyllithium

Product 1

HCID 214741334-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1-methyl-1,2,5,6-tetrahydropyridineYield 94%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-78 °C

Procedure

Dissolved 4-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)-1-methylpiperidine (12 g, 0.042 mol) in 250 mL of dry THF. Cooled to -78° C. under a nitrogen atmosphere. Added n-butyl lithium (18 mL of 2.5M in hexane) dropwise via addition funnel. Maintain temperature at 0° C. for 1 hour then recooled to -78° C. Added 21 mL of dry methanol, and let warm to room temperature. Added saturated NH4Cl, and extracted with THF. Dried combined organic extracts with MgSO4, filtered, and evaporated to give 11.3 g (94% yield) of 4-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1-methyl-1,2,5,6-tetrahydropyridine as a white solid.

Workup

  1. temperatureMaintain temperature at 0° C. for 1 hour
  2. customthen recooled to -78° C
  3. temperaturelet warm to room temperature
  4. extractionAdded saturated NH4Cl, and extracted with THF
  5. customDried
  6. filtrationfiltered
  7. customevaporated

Sources & evidence

ORD record
ord-95e4e78bd589475a83cf27cd9b845bc0
Source dataset
uspto-grants-1997_11
Patent number
US05688805

Reaction notes

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