Cesium carbonate → 4-{[N-((1R)-1-Carbamoyl-3-methyl-butyl)-N-(4-chlorobenzenesulfonyl)amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

HRID 1893839Notes

Reaction equation

HRID 1893839 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:11][C@H:12]([CH2:16][CH:17]([CH3:19])[CH3:18])[C:13]([NH2:15])=[O:14])(=[O:10])=[O:9])=[CH:4][CH:3]=1.C(=O)([O-])[O-].[Cs+].[Cs+].[C:26]([O:30][C:31]([N:33]1[CH2:38][CH2:37][CH:36]([CH2:39]OS(C2C=CC(C)=CC=2)(=O)=O)[CH2:35][CH2:34]1)=[O:32])([CH3:29])([CH3:28])[CH3:27]>CN(C=O)C>[C:26]([O:30][C:31]([N:33]1[CH2:38][CH2:37][CH:36]([CH2:39][N:11]([C@@H:12]([C:13](=[O:14])[NH2:15])[CH2:16][CH:17]([CH3:19])[CH3:18])[S:8]([C:5]2[CH:4]=[CH:3][C:2]([Cl:1])=[CH:7][CH:6]=2)(=[O:9])=[O:10])[CH2:35][CH2:34]1)=[O:32])([CH3:29])([CH3:27])[CH3:28]

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 106428511-(tert-Butoxycarbonyl)-4-((p-toluenesulfonyloxy)methyl)piperidineHCID 59001058(2R)-2-(4-Chlorobenzenesulfonylamino)-4-methylpentanoic acid amide

Product 1

HCID 590010954-{[N-((1R)-1-Carbamoyl-3-methyl-butyl)-N-(4-chlorobenzenesulfonyl)amino]-methyl}-piperidine-1-carboxylic acid tert-butyl esterYield 44%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

To a solution of (2R)-2-(4-chlorobenzenesulfonylamino)-4-methylpentanoic acid amide (4.2 grams, 14 mmol) in DMF (50 mL) was added cesium carbonate (13.6 grams, 417 mmol). To this reaction was added 4-(toluene-4-sulfonyloxymethyl)-piperidine 1-carboxylic acid tert-butyl ester (ref.: Gilissen, C. et al., J. Labeled Cmpd. Radiopharm., 42:1289 (1999); 10.4 g, 282 mmol). The reaction was stirred at 70° C. for 18 h. The reaction was then quenched with sat. aq. NaHCO3 and extracted with EtOAc. The organic layer was collected, washed with brine, dried over MgSO4, and concentrated to a clear oil. The oil was then purified on a BIOTAGE® 40S (eluted with 30% EtOAc in hexanes) to afford a white solid (3.0 g, 44%). MS (ESI), (M+H)+502.1; 1H NMR (DMSO-d6, 500 MHz) δ 7.86 (dd, 2H, J=2.0, 6.8), 7.65 (dd, 2H, J=2.0, 6.8) 7.37 (br s, 1H), 7.07 (br s, 1H), 4.19 (t, 1H, J=7.6), 3.92 (br s, 2H), 3.35 (dd, 1H, J=15, 6.8), 3.05 (dd, 1H, J=15, 8.1), 1.85 (br s, 1H), 1.50-1.70 (m, 4H), 1.38 (s, 9H), 1.10-1.20 (m, 1H), 0.80-1.00 (m, 3H), 0.82 (d, 6H, J=7.6).

Workup

  1. customThe reaction was then quenched with sat. aq. NaHCO3
  2. extractionextracted with EtOAc
  3. customThe organic layer was collected
  4. washwashed with brine
  5. dry with materialdried over MgSO4
  6. concentrationconcentrated to a clear oil
  7. customThe oil was then purified on a BIOTAGE® 40S (eluted with 30% EtOAc in hexanes)

Sources & evidence

ORD record
ord-43f72a338e08499c9eb8a73e0636fd0a
Source dataset
uspto-grants-2013_08
Patent number
US08513253B2

Reaction notes

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