Ethyl Acetate → HCID 67373410, compound

HRID 1971923Notes

Reaction equation

HRID 1971923 reaction equation
Cl.[CH2:2]([O:4][C:5]([CH:7]1[CH2:12][CH2:11][N:10]([CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH2:9][C:8]1=[O:20])=[O:6])[CH3:3].C(=O)(O)[O-].[Na+].[CH3:26][CH2:27]OC(C)=O>>[CH2:2]([O:4][C:5]([CH:7]1[CH2:12][CH2:11][N:10]([CH2:13][C:14]2[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=2)[CH:9]([CH2:26][CH3:27])[C:8]1=[O:20])=[O:6])[CH3:3]

Participants

4

Reactant 3

HCID 8857Ethyl AcetateHCID 516892Sodium BicarbonateHCID 2723880Ethyl 1-benzyl-3-oxopiperidine-4-carboxylate hydrochloride

Product 1

HCID 67373410HCID 67373410, compound

Procedure

To a stirred suspension of 1-benzyl-3-oxo-piperidine-4-carboxylic acid ethyl ester hydrochloride salt (25 g) in EtOAc (500 mL) was added saturated sodium bicarbonate solution (200 mL) and continued stirring for 2 h. The organic layer was separated, dried over Na2SO4, filtered and concentrated to provide ethyl 1-benzyl-3-oxo-piperidine-4-carboxylic acid ethyl ester (22.00 g). To a solution of ethyl 1-benzyl-3-oxo-piperidine-4-carboxylic acid ethyl ester (22 g, 84.18 mmol) in EtOAc (75 mL) was added (Boc)2O (20.21 g, 92.59 mmol) followed by 10% Pd—C (2.4 g) and the resultant reaction mixture was subjected to hydrogenation at 50 psi of hydrogen for 14 h. The catalyst was filtered by passing through a pad of celite, washed the celite pad with EtOAc (200 mL) and the combined filtrate was concentrated. The residue was purified by flash silica gel column chromatography by eluting with 0.5% ethyl acetate in hexanes to provide ethyl 3-oxo-piperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester (34 g).

Workup

  1. customThe organic layer was separated
  2. dry with materialdried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-a2098b76295f4ebf8d0ba42febbade90
Source dataset
uspto-grants-2013_04
Patent number
US08431575B2

Reaction notes

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