Potassium Carbonate → Rac-4-[3-(2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy)-5-methoxy-benzoylamino]-piperidine-1-carboxylic acid tert-butyl ester

HRID 502436Notes

Reaction equation

HRID 502436 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([NH:14][C:15](=[O:25])[C:16]2[CH:21]=[C:20]([O:22][CH3:23])[CH:19]=[C:18](O)[CH:17]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+].C1(C)C=CC(S([O:41][CH2:42][CH:43]2[CH2:47][O:46][C:45]([CH3:49])([CH3:48])[O:44]2)(=O)=O)=CC=1>CC#N>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([NH:14][C:15](=[O:25])[C:16]2[CH:21]=[C:20]([O:22][CH3:23])[CH:19]=[C:18]([O:41][CH2:42][CH:43]3[CH2:47][O:46][C:45]([CH3:48])([CH3:49])[O:44]3)[CH:17]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 2350972,2-Dimethyl-1,3-dioxolan-4-ylmethyl p-toluenesulfonateHCID 684587374-(3-Hydroxy-5-methoxy-benzoylamino)-piperidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 68456964Rac-4-[3-(2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy)-5-methoxy-benzoylamino]-piperidine-1-carboxylic acid tert-butyl esterYield 71.1%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

1.60 g (4.6 mmol) of 4-(3-hydroxy-5-methoxy-benzoylamino)-piperidine-1-carboxylic acid tert-butyl ester (example 168a) was dissolved in 50 ml of MeCN at rt; 1.29 g (9.4 mmol) of anhydrous potassium carbonate was added, followed by 1.495 g (4.8 mmol) of rac-2,2-dimethyl-1,3-dioxolan-4-yl-methyl p-toluenesulfonate. The reaction mixture was stirred at reflux for 22 hours. It was then cooled down to ambient temperature and poured into crashed ice and extracted twice with EtOAc. The organic phases were washed with water and brine, dried over MgSO4, filtered and evaporated i.V. and the residue (2.11 g) was purified by chromatography (SiO2, MeCl2/MeOH) to yield 1.52 g of the title compound as a colorless amorphous solid. MS: 465.2 (MH+).

Workup

  1. temperatureat reflux for 22 hours
  2. additionpoured
  3. extractionextracted twice with EtOAc
  4. washThe organic phases were washed with water and brine
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. customevaporated i.V
  8. customand the residue (2.11 g) was purified by chromatography (SiO2, MeCl2/MeOH)

Sources & evidence

ORD record
ord-467ae3a0b4be4af581649094ab5d79a6
Source dataset
uspto-grants-2010_08
Patent number
US07772253B2

Reaction notes

Loading…