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Tributylphenyltin → 2-Cyclopropyl-7-methoxy-5-methyl-6-phenyl-1,3-benzoxazole-4-carbonitrile

HRID 17616
Notes
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Reaction equation

HRID 17616 reaction equation
Br[C:2]1[C:3]([O:17][CH3:18])=[C:4]2[O:8][C:7]([CH:9]3[CH2:11][CH2:10]3)=[N:6][C:5]2=[C:12]([C:15]#[N:16])[C:13]=1[CH3:14].C([Sn](CCCC)(CCCC)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)CCC.C(C1(C)C(O)=C(C(C)(C)C)C=CC1)(C)(C)C>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.O1CCOCC1>[CH:9]1([C:7]2[O:8][C:4]3[C:5](=[C:12]([C:15]#[N:16])[C:13]([CH3:14])=[C:2]([C:24]4[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=4)[C:3]=3[O:17][CH3:18])[N:6]=2)[CH2:11][CH2:10]1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 607632TributylphenyltinHCID 666371922,6-Di-t-butylcresolHCID 685847456-Bromo-2-cyclopropyl-7-methoxy-5-methyl-1,3-benzoxazole-4-carbonitrile

Product 1

HCID 685848562-Cyclopropyl-7-methoxy-5-methyl-6-phenyl-1,3-benzoxazole-4-carbonitrileYield 98%

Reagents, catalysts & solvents 2

HCID 178418476
HCID 178418476, compound
Catalyst
HCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

Under argon atmosphere, bis(triphenylphosphine)palladium(II) dichloride (777 mg, 1.11 mmol) was added to a 1,4-dioxane (110 ml) solution of 6-bromo-2-cyclopropyl-7-methoxy-5-methyl-1,3-benzoxazole-4-carbonitrile (I-83) (3.40 g, 11.1 mmol), tributylphenyltin (5.28 g, 14.4 mmol) and 2,6-di-tert-butylcresol (488 mg, 2.21 mmol), followed by stirring in an oil bath at 100° C. for 15 hours. The reaction liquid was concentrated under reduced pressure, the residue was dissolved in ethyl acetate, and washed with water and saturated brine. After drying over anhydrous sodium sulfate, the insoluble matter was separated by filtration, and the residue obtained by concentration was washed with diethyl ether to obtain the entitled compound (3.30 g, 98%) as a pale gray solid.

Workup

  1. customThe reaction liquid
  2. concentrationwas concentrated under reduced pressure
  3. dissolutionthe residue was dissolved in ethyl acetate
  4. washwashed with water and saturated brine
  5. dry with materialAfter drying over anhydrous sodium sulfate
  6. customthe insoluble matter was separated by filtration
  7. customthe residue obtained by concentration
  8. washwas washed with diethyl ether

Sources & evidence

ORD record
ord-68507d3cc36e415e80c5a36e8ee390ba
Source dataset
uspto-grants-2010_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07737166B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes