Water → 3,3-Dimethyl-2,3-dihydro-1-benzofuran-4-ol

HRID 2278301Notes

Reaction equation

HRID 2278301 reaction equation
[CH3:1][C:2]1([CH3:13])[C:6]2[C:7]([O:11]C)=[CH:8][CH:9]=[CH:10][C:5]=2[O:4][CH2:3]1.B(Br)(Br)Br.O>ClCCl>[CH3:1][C:2]1([CH3:13])[C:6]2=[C:7]([OH:11])[CH:8]=[CH:9][CH:10]=[C:5]2[O:4][CH2:3]1

Participants

5

Reactant 3

HCID 962WaterHCID 25134Boron tribromideHCID 575170913,3-Dimethyl-4-(methyloxy)-2,3-dihydro-1-benzofuran2×

Product 1

HCID 574112993,3-Dimethyl-2,3-dihydro-1-benzofuran-4-olYield 76%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 3,3-dimethyl-4-(methyloxy)-2,3-dihydro-1-benzofuran (Intermediate 5, 4.0 g) in dichloromethane (100 ml, SCRC) was added BBr3 (6.37 ml, 67.3 mmol, SCRC) dropwise under ice-cooling. After the addition was complete, the reaction mixture was stirred for 2 hours at room temperature and then water (20 ml) was added. The resulting mixture was extracted with ethyl acetate (3 times 100 ml, SCRC) and the combined organic layers were dried, evaporated and purified by silica gel chromatography with EtOAc/PE as eluents (1/20) to afford the title compound (2.8 g).

Workup

  1. temperaturecooling
  2. additionAfter the addition
  3. extractionThe resulting mixture was extracted with ethyl acetate (3 times 100 ml, SCRC)
  4. customthe combined organic layers were dried
  5. customevaporated
  6. custompurified by silica gel chromatography with EtOAc/PE as eluents (1/20)

Sources & evidence

ORD record
ord-89d506f7ab0a4d81a92877bcec343dfc
Source dataset
uspto-grants-2015_09
Patent number
US09133175B2

Reaction notes

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