Cesium carbonate → Methyl cis(+/-)-5-(4-{[(benzyloxy)carbonyl]amino}-3-methoxypiperidin-1-yl)thiophene-2-carboxylate

HRID 1425411Notes

Reaction equation

HRID 1425411 reaction equation
Br[C:2]1[S:6][C:5]([C:7]([O:9][CH2:10]C)=[O:8])=[CH:4][CH:3]=1.[CH3:12][O:13][C@H:14]1[C@@H:19]([NH:20][C:21](=[O:30])[O:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[CH2:18][CH2:17][NH:16][CH2:15]1.C1C=CC(P(C2C(C3C(P(C4C=CC=CC=4)C4C=CC=CC=4)=CC=C4C=3C=CC=C4)=C3C(C=CC=C3)=CC=2)C2C=CC=CC=2)=CC=1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1(C)C=CC=CC=1.C(OCC)(=O)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH2:23]([O:22][C:21]([NH:20][C@H:19]1[CH2:18][CH2:17][N:16]([C:2]2[S:6][C:5]([C:7]([O:9][CH3:10])=[O:8])=[CH:4][CH:3]=2)[CH2:15][C@H:14]1[O:13][CH3:12])=[O:30])[C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1

Participants

8

Reactant 4

HCID 10796Cesium carbonateHCID 605723Ethyl 5-bromothiophene-2-carboxylateHCID 634876Binap, (A+-)-HCID 86648490Benzyl cis(+/-)-[3-methoxypiperidin-4-yl]carbamate

Product 1

HCID 86648823Methyl cis(+/-)-5-(4-{[(benzyloxy)carbonyl]amino}-3-methoxypiperidin-1-yl)thiophene-2-carboxylateYield 60.4%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 1140TolueneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
110 °C

Procedure

A suspension of ethyl 5-bromothiophene-2-carboxylate obtained in Example (244a) (100 mg, 0.45 mmol), benzyl cis(±)-(3-methoxypiperidin-4-yl)-carbamate obtained in Example (40b) (143 mg, 0.54 mmol), palladium acetate (10 mg, 0.05 mmol), BINAP (28 mg, 0.05 mmol) and cesium carbonate (206 mg, 0.63 mmol) in toluene was stirred at 110° C. for 39 hours. The reaction solution was diluted with ethyl acetate, washed with water and brine, and then dried over anhydrous magnesium sulfate. Following filtration, the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=2/1) to obtain 110 mg of the title compound as a yellow oily substance (60%).

Workup

  1. washwashed with water and brine
  2. dry with materialdried over anhydrous magnesium sulfate
  3. filtrationfiltration
  4. concentrationthe filtrate was concentrated under reduced pressure
  5. customThe resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=2/1)

Sources & evidence

ORD record
ord-f2ddc54ba76a46d8bb08d221dd38a04b
Source dataset
uspto-grants-2015_01
Patent number
US08927588B2

Reaction notes

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