Trimethylsilylacetylene → N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(4-trimethylsilylethynylphenyl)benzoxazole-4-carboxamide

HRID 969862Notes

Reaction equation

HRID 969862 reaction equation
[N:1]12[CH2:8][CH2:7][CH:4]([CH2:5][CH2:6]1)[CH:3]([NH:9][C:10]([C:12]1[CH:13]=[CH:14][CH:15]=[C:16]3[O:20][C:19]([C:21]4[CH:26]=[CH:25][C:24](I)=[CH:23][CH:22]=4)=[N:18][C:17]=13)=[O:11])[CH2:2]2.[CH3:28][Si:29]([C:32]#[CH:33])([CH3:31])[CH3:30]>CN(C=O)C.C(N(CC)CC)C.[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>[N:1]12[CH2:8][CH2:7][CH:4]([CH2:5][CH2:6]1)[CH:3]([NH:9][C:10]([C:12]1[CH:13]=[CH:14][CH:15]=[C:16]3[O:20][C:19]([C:21]4[CH:26]=[CH:25][C:24]([C:33]#[C:32][Si:29]([CH3:31])([CH3:30])[CH3:28])=[CH:23][CH:22]=4)=[N:18][C:17]=13)=[O:11])[CH2:2]2

Participants

7

Reactant 2

HCID 66111TrimethylsilylacetyleneHCID 11518485HCID 11518485, compound

Product 1

HCID 11525069N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(4-trimethylsilylethynylphenyl)benzoxazole-4-carboxamideYield 94%

Reagents, catalysts & solvents 4

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 6228DimethylformamideSolventHCID 8471TriethylamineSolvent

Procedure

To a solution of N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(4-iodophenyl)benzoxazole-4-carboxamide (50 mg, 0.11 mmol) in DMF (1 mL) and triethylamine (1 mL), (trimethylsilyl)acetylene (0.045 mL, 0.33 mmol) was added at room temperature followed by copper(I) iodide (4.2 mg, 0.022 mmol) and bis(triphenylphosphine)dichloropalladium(II) (7.7 mg, 0.011 mmol). The resulting mixture was stirred under nitrogen at room temperature for 1 h, and then was quenched with water, extracted with methylene chloride. The combined organic layers were washed with water and brine, dried (Na2SO4), filtered and concentrated. The crude material was purified by column chromatography (silica gel, 90:10:1 ethyl acetate/methanol/concentrated ammonium hydroxide) to afford N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(4-trimethylsilylethynylphenyl)benzoxazole-4-carboxamide (44 mg, 94%) as a light yellow solid: 1H NMR (500 MHz, CDCl3) δ 9.51 (d, J=7.0 Hz, 1H), 8.20 (dd, J=8.0, 1.0 Hz, 1H), 8.17 (d, J=8.0 Hz, 2H), 7.72 (dd, J=8.0, 1.0 Hz, 1H), 7.64 (d, J=8.0 Hz, 2H), 7.49 (t, J=8.0 Hz, 1H), 4.32-4.29 (m, 1H), 3.52 (ddd, J=14.0, 9.5, 2.0 Hz, 1H), 3.12-2.76 (m, 5H), 2.18-2.02 (m, 2H), 1.80-1.62 (m, 3H), 0.29 (s, 9H); MS (ESI+) m/z 444 (M+H); HPLC>99% (AUC), tR=14.91 min.

Workup

  1. customwas quenched with water
  2. extractionextracted with methylene chloride
  3. washThe combined organic layers were washed with water and brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude material was purified by column chromatography (silica gel, 90:10:1 ethyl acetate/methanol/concentrated ammonium hydroxide)

Sources & evidence

ORD record
ord-05dbaf9f92dd4f96bb6c57e61a13618a
Source dataset
uspto-grants-2007_12
Patent number
US07307094B2

Reaction notes

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