Sodium bis(trimethylsilyl)amide → Methyl (1s,2s,5e)-5-benzylidene-2-[(4-phenylpiperazin-1-yl)carbonyl]cyclohexanecarboxylate

HRID 61489

Reaction equation

HRID 61489 reaction equation
[Br-].[CH2:2]([P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Na+].O=[C:39]1[CH2:44][C@H:43]([C:45]([O:47][CH3:48])=[O:46])[C@@H:42]([C:49]([N:51]2[CH2:56][CH2:55][N:54]([C:57]3[CH:62]=[CH:61][CH:60]=[CH:59][CH:58]=3)[CH2:53][CH2:52]2)=[O:50])[CH2:41][CH2:40]1>C1COCC1>[CH:2](=[C:39]1/[CH2:40][CH2:41][C@H:42]([C:49]([N:51]2[CH2:56][CH2:55][N:54]([C:57]3[CH:62]=[CH:61][CH:60]=[CH:59][CH:58]=3)[CH2:53][CH2:52]2)=[O:50])[C@@H:43]([C:45]([O:47][CH3:48])=[O:46])[CH2:44]/1)/[C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

5

Reactant 3

HCID 2724254Sodium bis(trimethylsilyl)amideHCID 2734970Benzyltriphenylphosphonium bromideHCID 67304345Methyl (1s,2s)-5-oxo-2-[(4-phenylpiperazin-1-yl)carbonyl]cyclohexanecarboxylate

Product 1

HCID 67304520Methyl (1s,2s,5e)-5-benzylidene-2-[(4-phenylpiperazin-1-yl)carbonyl]cyclohexanecarboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Procedure

To a suspension of benzyltriphenylphosphonium bromide (0.397 g, 0.000880 mol) in anhydrous THF (3.0 mL) at rt was added 1.00 M of sodium bis(trimethylsilyl)amide in tetrahydrofuran (0.880 mL) dropwise. The resulting orange suspension was stirred at rt for 1 h, a solution of methyl(1S,2S)-5-oxo-2-[(4-phenylpiperazin-1-yl)carbonyl]cyclohexanecarboxylate (202 mg, 0.000586 mol) in anhydrous THF (3.0 mL) was then added via cannula. The reaction mixture was stirred at rt for 18 h. The reaction was quenched with water (20 mL), extracted with EtOAc (2×). The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by Combiflash with 20-60% EtOAc/Hex to give the product (141 mg, 57% in yield) as well as the S.M. (50 mg, 25% recovery of S.M.). MS (ESI): (M+H)+=419.2.

Workup

  1. stirringThe reaction mixture was stirred at rt for 18 h
  2. customThe reaction was quenched with water (20 mL)
  3. extractionextracted with EtOAc (2×)
  4. washThe combined organic layers were washed with brine
  5. dry with materialdried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by Combiflash with 20-60% EtOAc/Hex
  9. customto give
  10. customthe product (141 mg, 57% in yield) as well as the S.M

Sources & evidence

ORD record
ord-b70ab8e192c445b3968a739d462c372e
Source dataset
uspto-grants-2016_09
Patent number
US09440958B2

Linked notes

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