Cesium carbonate → 3-(Di-tert-butoxycarbonylamino)-1-methylpiperidine

HRID 1373434Notes

Reaction equation

HRID 1373434 reaction equation
BrC[CH:3]1[CH2:8][CH2:7][CH2:6][N:5]([CH3:9])[CH2:4]1.[CH3:10][C:11]([O:14][C:15]([NH:17][C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[O:16])([CH3:13])[CH3:12].C(=O)([O-])[O-].[Cs+].[Cs+]>C(#N)C.[I-].[Li+]>[C:21]([O:20][C:18]([N:17]([C:15]([O:14][C:11]([CH3:13])([CH3:12])[CH3:10])=[O:16])[CH:3]1[CH2:8][CH2:7][CH2:6][N:5]([CH3:9])[CH2:4]1)=[O:19])([CH3:24])([CH3:23])[CH3:22]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 279800Di-tert-butyl IminodicarboxylateHCID 219309923-(Bromomethyl)-1-methylpiperidine

Product 1

HCID 219309943-(Di-tert-butoxycarbonylamino)-1-methylpiperidineYield 54.2%

Reagents, catalysts & solvents 2

HCID 66321Lithium iodideCatalystHCID 6342AcetonitrileSolvent

Conditions

Temperature
70 °C

Procedure

3-(Bromomethyl)-1-methylpiperidine (1.5 g, 7.81 mmoles) (from Preparative Example 244, Step A above) and di-tert-butyliminodicarboxylate (1.697 g, 7.81 mmoles) were dissolved in anhydrous acetonitrile (25 mL). Cesium carbonate (5.1 g, 15.6 mmoles) and lithium iodide (52 mg, 0.391 mmoles) were added and the mixture was stirred at 70° C. for 20h. The mixture was evaporated to dryness and the residue was partitioned between dichloromethane and saturated aqueous sodium bicarbonate. The organic layer was dried (MgSO4), filtered and evaporated to dryness. the residue was chromatographed on a silica gel column (30×5 cm) using 3% methanol in dichloromethane as the eluant to give 3-(di-tert-butoxycarbonylamino)-1-methylpiperidine (1.331 g, 52%): FABMS: m/z 329.2 (MH+); HRFABMS: m/z 329.2438 (MH+). Calcd. for C17H33N2O4: m/z 329.2440; δH (CDCl3) 1.10 (1H, m, CH2), 1.54 (18H, s, —COOC(CH3)3), 1.86 (2H, m, CH2), 2.01 (1H, m, CH2), 2.19 (1H m, CH), 2.34 (2H, bm, CH2), 2.59 (3H, —NCH3), 3.19 (2H, m, CH2) and 3.52/3.52 ppm (2H, —CH2N—); δC (CDCl3) CH3: 28.5, 28.5, 28.5, 28.5, 28.5, 28.5, 47.2; CH2: 25.4, 28.3, 50.4, 56.8, 60.8; CH: 37.2; C, 83.0, 83.0, 153.5, 153.5.

Workup

  1. customThe mixture was evaporated to dryness
  2. customthe residue was partitioned between dichloromethane and saturated aqueous sodium bicarbonate
  3. dry with materialThe organic layer was dried (MgSO4)
  4. filtrationfiltered
  5. customevaporated to dryness
  6. customthe residue was chromatographed on a silica gel column (30×5 cm)

Sources & evidence

ORD record
ord-2f65849e84034191ba0e788088108bfb
Source dataset
uspto-grants-2007_01
Patent number
US07161003B1

Reaction notes

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