Sodium Carbonate → 7-Phenylisochroman-4-one

HRID 1683752Notes

Reaction equation

HRID 1683752 reaction equation
[C:1]1(OB(O)O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:11](=[O:14])([O-])[O-].[Na+].[Na+].[C:17]1([CH3:23])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.[CH2:24]([OH:26])C>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:1]1([C:21]2[CH:22]=[C:17]3[C:18]([C:11](=[O:14])[CH2:24][O:26][CH2:23]3)=[CH:19][CH:20]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 78412Phenyl dihydrogen orthoborateHCID 21863594Toluene ethanol

Product 1

HCID 186867407-Phenylisochroman-4-oneYield 70%

Reagents, catalysts & solvents 2

HCID 74236Tetrabutylammonium BromideCatalystHCID 178418397HCID 178418397, compoundCatalyst

Procedure

Nitrogen gas was bubbled through a mixture of the product of part e (0.611 g, 27 mmol) and phenylboric acid (0.36 g, 29 mmol) in 5:2 toluene/ethanol(30 mL) for 4 hours. Sodium carbonate (0.57 g, 5.38 mmol) was added followed by tetrabutylammonium bromide (0.049 g, 0.13 mmol) and tetrakis(triphenylphosphine)palladium (0.012 g, 0.04 mmol). The solution was heated at reflux for 18 h, cooled to room temperature, and evaporated. The residue was taken up in water (50 mL) and extracted with ethyl acetate (3×20 mL). The organics were combined, washed with brine, dried and evaporated. The solid was recrystallized from hexane to provide 0.429 g (70%) of 7-phenylisochroman-4-one as a gold-colored solid, mp 127°-128° C.: 1H NMR (CDCl3) δ 8.12 (d, 1H), 7.60-7.66 (m, 3H), 7.39-7.51 (m, 4H), 4.96 (s, 2H), 4.41 (s, 2H); IR (KBr) 1688 cm-1 ; Mass spectrum m/z =225 (M+H); Anal. calcd. for C15H12O2 : C 80.34, H 5.39; Found: C 80.03, H 5.45.

Workup

  1. temperatureThe solution was heated
  2. temperatureat reflux for 18 h
  3. customevaporated
  4. extractionextracted with ethyl acetate (3×20 mL)
  5. washwashed with brine
  6. customdried
  7. customevaporated
  8. customThe solid was recrystallized from hexane

Sources & evidence

ORD record
ord-45691d489d9a43769a852027bfa5a531
Source dataset
uspto-grants-1997_06
Patent number
US05639759

Reaction notes

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