Triethylamine → (4R,5R)-4-(5-Fluoro-2-(phenylethynyl)pyridin-4-yl)-5-(2-fluorophenyl)oxazolidin-2-one

HRID 2362462Notes

Reaction equation

HRID 2362462 reaction equation
Br[C:2]1[CH:7]=[C:6]([C@@H:8]2[C@@H:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=3[F:19])[O:11][C:10](=[O:20])[NH:9]2)[C:5]([F:21])=[CH:4][N:3]=1.C(N(CC)CC)C.[C:29]([C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)#[CH:30].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[Cu]I.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[F:21][C:5]1[C:6]([C@@H:8]2[C@@H:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=3[F:19])[O:11][C:10](=[O:20])[NH:9]2)=[CH:7][C:2]([C:30]#[C:29][C:31]2[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=2)=[N:3][CH:4]=1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 10821PhenylacetyleneHCID 11776TriphenylphosphineHCID 86673441(4R,5R)-4-(2-bromo-5-fluoropyridin-4-yl)-5-(2-fluorophenyl)oxazolidin-2-one

Product 1

HCID 69084026(4R,5R)-4-(5-Fluoro-2-(phenylethynyl)pyridin-4-yl)-5-(2-fluorophenyl)oxazolidin-2-one

Reagents, catalysts & solvents 2

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalyst

Conditions

Temperature
90 °C

Procedure

A suspension of optically-enriched (4R,5R)-4-(2-bromo-5-fluoropyridin-4-yl)-5-(2-fluorophenyl)oxazolidin-2-one (38 mg, 0.107 mmol) in triethylamine (1.1 mL, 8.03 mmol) was degassed by bubbling with nitrogen for 30 min. To this was added ethynylbenzene (15 μl, 0.134 mmol) and triphenylphosphine (3.7 mg, 0.014 mmol). After bubbling 5 min longer, the reaction was treated with copper(I) iodide (0.408 mg, 2.14 μmol) and bis(triphenylphosphine)palladium(II) chloride (1.8 mg, 2.6 μmol), bubbled briefly with nitrogen, sealed, and heated at 90° C. for 5 h. The reaction was concentrated, dissolved in a minimum of dichloromethane, diluted with ethyl acetate, washed with brine, dried over magnesium sulfate, and concentrated. Column chromatography (25%→50% EtOAc/Hex) gave a mixture of the two regioisomers. This material was further purified by chiral prep HPLC (Chiralcel OD, 40% EtOH/heptane/0.1% DEA) to give 9.6 mg (23%). 1H NMR (CDCl3) δ: 8.49 (d, J=1.2 Hz, 1H), 7.76 (d, J=5.8 Hz, 1H), 7.58-7.67 (m, 2H), 7.51 (td, J=7.5, 1.5 Hz, 1H), 7.35-7.48 (m, 4H), 7.23-7.28 (m, 1H), 7.16 (ddd, J=9.8, 8.9, 0.8 Hz, 1H), 6.28 (br. s., 1H), 5.62 (d, J=5.8 Hz, 1H), 5.17 (d, J=5.8 Hz, 1H). 13C NMR (CDCl3) δ: 160.1, 158.4, 156.2, 140.8, 139.2, 135.3, 132.2, 131.4, 129.5, 128.6, 127.5, 125.2, 124.9, 124.5, 121.8, 116.2, 90.2, 87.3, 79.3, 56.6. 19F NMR (CDCl3) δ: −117.69 (d, J=8.7 Hz, 1F), −132.34 (d, J=8.7 Hz, 1F). Mass spec.: 377.2 (MH)+.

Workup

  1. customwas degassed
  2. customby bubbling with nitrogen for 30 min
  3. customAfter bubbling 5 min longer
  4. custombubbled briefly with nitrogen
  5. customsealed
  6. concentrationThe reaction was concentrated
  7. dissolutiondissolved in a minimum of dichloromethane
  8. additiondiluted with ethyl acetate
  9. washwashed with brine
  10. dry with materialdried over magnesium sulfate
  11. concentrationconcentrated
  12. customColumn chromatography (25%→50% EtOAc/Hex) gave
  13. additiona mixture of the two regioisomers
  14. customThis material was further purified by chiral prep HPLC (Chiralcel OD, 40% EtOH/heptane/0.1% DEA)
  15. customto give 9.6 mg (23%)

Sources & evidence

ORD record
ord-3de10c19b3a846bcab28557db1f296a2
Source dataset
uspto-grants-2014_04
Patent number
US08691821B2

Reaction notes

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