4-Bromophenol → 2-({3-[2-(4-bromophenoxy)ethyl]cyclobutyl}oxy)tetrahydro-2H-pyran

HRID 84256

Reaction equation

HRID 84256 reaction equation
[O:1]1[CH2:6][CH2:5][CH2:4][CH2:3][CH:2]1[O:7][CH:8]1[CH2:11][CH:10]([CH2:12][CH2:13][OH:14])[CH2:9]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[Br:34][C:35]1[CH:40]=[CH:39][C:38](O)=[CH:37][CH:36]=1.CCOC(/N=N/C(OCC)=O)=O>O1CCCC1.C(OCC)(=O)C>[Br:34][C:35]1[CH:40]=[CH:39][C:38]([O:14][CH2:13][CH2:12][CH:10]2[CH2:9][CH:8]([O:7][CH:2]3[CH2:3][CH2:4][CH2:5][CH2:6][O:1]3)[CH2:11]2)=[CH:37][CH:36]=1

Participants

7

Reactant 4

HCID 78084-BromophenolHCID 11776TriphenylphosphineHCID 5462977Diethyl azodicarboxylateHCID 672483422-[3-(Tetrahydro-2H-pyran-2-yloxy)cyclobutyl]ethanol

Product 1

HCID 672483172-({3-[2-(4-bromophenoxy)ethyl]cyclobutyl}oxy)tetrahydro-2H-pyranYield 32.5%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

2-[3-(Tetrahydro-2H-pyran-2-yloxy)cyclobutyl]ethanol (1.08 g, 5.39 mmol) was dissolved in tetrahydrofuran (20 mL) and was cooled in an ice bath. Triphenylphosphine (2.12 g, 8.09 mmol) and 4-bromo-phenol (1.12 g, 6.47 mmol) were added and the reaction was stirred until dissolved. Diethylazodicarboxylate (1.45 g, 8.09 mmol) was added dropwise to the reaction and the reaction was then warmed to room temperature and stirred for 48 hours. The reaction was diluted with ethyl acetate and washed with 1 N aqueous sodium hydroxide. The organic layer was dried over magnesium sulfate, filtered and evaporated in vacuo to give a clear oil. Purification on silica gel with heptane-ethyl acetate (15% ethyl acetate) gave 2-({3-[2-(4-bromophenoxy)ethyl]cyclobutyl}oxy)tetrahydro-2H-pyran (622 mg, 32.4%) as a clear oil. Partial 1H NMR indicated a −4:1 mix of unknown cis-trans isomers. (CDCl3, δ ppm, key peaks are 4.08 (m, 0.80H), 4.38 (m, 0.20H), 6.74 (d, J=8.98, 2H), 7.34 (d, J=9.18, 2H).

Workup

  1. temperaturewas cooled in an ice bath
  2. dissolutionuntil dissolved
  3. stirringstirred for 48 hours
  4. washwashed with 1 N aqueous sodium hydroxide
  5. dry with materialThe organic layer was dried over magnesium sulfate
  6. filtrationfiltered
  7. customevaporated in vacuo
  8. customto give a clear oil
  9. customPurification on silica gel with heptane-ethyl acetate (15% ethyl acetate)

Sources & evidence

ORD record
ord-25f98f02f8614d41a454a5304f6585f4
Source dataset
uspto-grants-2014_09
Patent number
US08846933B2

Linked notes

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