Sodium hydride → 1-(t-Butoxycarbonyl)-4-(3-oxo-3-(3-pyridyl)prop-1-enyl)piperidine

HRID 1386807Notes

Reaction equation

HRID 1386807 reaction equation
[O:1]=[C:2]([C:10]1[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=1)[CH2:3]P(=O)(OC)OC.[H-].[Na+].[C:18]([O:22][C:23]([N:25]1[CH2:30][CH2:29][CH:28]([CH:31]=O)[CH2:27][CH2:26]1)=[O:24])([CH3:21])([CH3:20])[CH3:19]>C1COCC1.CCOCC>[C:18]([O:22][C:23]([N:25]1[CH2:30][CH2:29][CH:28]([CH:31]=[CH:3][C:2](=[O:1])[C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[CH2:27][CH2:26]1)=[O:24])([CH3:21])([CH3:19])[CH3:20]

Participants

6

Reactant 3

HCID 24758Sodium hydrideHCID 1514430tert-Butyl 4-formylpiperidine-1-carboxylateHCID 18950746Dimethyl [2-oxo-2-(pyridin-3-yl)ethyl]phosphonate

Product 1

HCID 572456551-(t-Butoxycarbonyl)-4-(3-oxo-3-(3-pyridyl)prop-1-enyl)piperidineYield 80.5%

Reagents, catalysts & solvents 2

HCID 3283Diethyl EtherSolventHCID 8028TetrahydrofuranSolvent3×

Conditions

Temperature
45 °C

Procedure

A solution of dimethyl (2-oxo-2-(3-pyridyl)ethyl)phosphonate (150 mg, 0.65 mmol, from EXAMPLE 213, Step A) in THF (1.8 mL) was added to a stirred suspension of sodium hydride (60% oil dispersion, 15 mg of NaH, 0.63 mmol) in THF (3.0 mL). The resulting suspension was warmed in a 45° C. oil bath for 30 min. After the mixture had cooled to RT, 1-(t-butoxycarbonyl)-4 piperidinecarboxaldehyde (112 mg, 0.53 mmol) was added in THF (1.5 mL). After stirring overnight at RT, the mixure was diluted with ether (20 mL) and washed with 2.5 N NaOH (20 mL) followed by saturated aq. NaCl (20 mL). The aq. layers were extracted in succession with ether (20 mL), and the combined organic layers were dried (Na2SO4), decanted, and evaporated. Purification by flash column chromatography on silica gel, eluting with 80:20 v/v to 60:40 v/v hexanes/EtOAc, gave 135 mg of the title compound (trans isomer) as a yellow syrup. For the title compound: 1H NMR (500 M , CDCl3) δ 9.17-9.13 (bs, 1H), 8.81 (bd, J=4, 1H), 8.27 (d, J=8, 1H), 7.49 (dd, J=8, 4, 1H), 7.07 (dd, J=15, 7, 1H), 6.85 (dd, J=15, 1, 1H), 4.254.13 (bs, 2H), 2.87-2.78 (m, 2H), 2.51-2.41 (m, 1H), 1.83 (d, J=12, 2H), 1.49 (s, 9H), 1.45 (qd, J=12, 4, 2H); ESI-MS 261 (M+H−56), 217 (M+H−100); HPLC A: 1.73 min.

Workup

  1. temperatureAfter the mixture had cooled to RT
  2. washwashed with 2.5 N NaOH (20 mL)
  3. extractionThe aq. layers were extracted in succession with ether (20 mL)
  4. dry with materialthe combined organic layers were dried (Na2SO4)
  5. customdecanted
  6. customevaporated
  7. customPurification by flash column chromatography on silica gel
  8. washeluting with 80:20 v/v to 60:40 v/v hexanes/EtOAc

Sources & evidence

ORD record
ord-6cd68c0bb2c64e9bad39cc6b79acbdd4
Source dataset
uspto-grants-2001_07
Patent number
US06265434B1

Reaction notes

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