4-Amino-1-Boc-piperidine → 4-(5-Benzyloxy-pyridin-2-ylamino)-piperidine-1-carboxylic acid tert-butyl ester

HRID 2355622Notes

Reaction equation

HRID 2355622 reaction equation
[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12](Cl)=[N:13][CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:16]([O:20][C:21]([N:23]1[CH2:28][CH2:27][CH:26]([NH2:29])[CH2:25][CH2:24]1)=[O:22])([CH3:19])([CH3:18])[CH3:17].O(C(C)(C)C)[K]>C1(C)C=CC=CC=1.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C1(P(C2C=CC=CC=2)C2C=CC3C(=CC=CC=3)C=2C2C3C(=CC=CC=3)C=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:16]([O:20][C:21]([N:23]1[CH2:28][CH2:27][CH:26]([NH:29][C:12]2[CH:11]=[CH:10][C:9]([O:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)=[CH:14][N:13]=2)[CH2:25][CH2:24]1)=[O:22])([CH3:19])([CH3:17])[CH3:18]

Participants

7

Reactant 3

HCID 12682914-Amino-1-Boc-piperidineHCID 100137175-(Benzyloxy)-2-chloropyridineHCID 178418922HCID 178418922, compound

Product 1

HCID 674007704-(5-Benzyloxy-pyridin-2-ylamino)-piperidine-1-carboxylic acid tert-butyl esterYield 87%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 634876Binap, (A+-)-CatalystHCID 1140TolueneSolvent

Conditions

Temperature
70 °C

Procedure

A stirred suspension of 5-benzyloxy-2-chloro-pyridine (12.4 g, 56.4 mmol, 1.0 equiv; prepared as described in WO 9728 128 A1 (Zeneca Ltd., UK)), 4-amino-piperidine-1-carboxylic acid tert-butyl ester (11.31 g, 56.4 mmol, 1.0 equiv), palladium(II) acetate (0.51 g, 2.3 mmol, 0.04 equiv) and rac-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene (1.44 g, 2.3 mmol, 0.04 equiv) in toluene (250 mL) was treated at rt with KOtert-Bu (6.71 g, 67.7 mmol, 1.2 equiv) and subsequently warmed to 70° C. After 7 h, the reaction mixture was poured into crashed ice and filtered over dicalite and extracted twice with toluene. The combined organic layers were dried over MgSO4, filtered and concentrated by evaporation under reduced pressure. The crude product was purified by column chromatography on silica eluting with a gradient of dichloromethane/methanol to give 18.73 g (87%) of the title compound as a light yellow solid. MS (ISP): 384.1 [M+H]+.

Workup

  1. additionthe reaction mixture was poured
  2. filtrationfiltered over dicalite
  3. extractionextracted twice with toluene
  4. dry with materialThe combined organic layers were dried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated by evaporation under reduced pressure
  7. customThe crude product was purified by column chromatography on silica eluting with a gradient of dichloromethane/methanol

Sources & evidence

ORD record
ord-4ca902d49bab40e2a71ebde70c2a0198
Source dataset
uspto-grants-2010_07
Patent number
US07754744B2

Reaction notes

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