Dimethylformamide → 2-[3-Methoxy-4-[(4-methoxyphenyl)methoxy]phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

HRID 901437Notes

Reaction equation

HRID 901437 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[C:7]([B:9]2[O:13][C:12]([CH3:15])([CH3:14])[C:11]([CH3:17])([CH3:16])[O:10]2)[CH:6]=[CH:5][C:4]=1[OH:18].CN(C=O)C.[H-].[Na+].[CH3:26][O:27][C:28]1[CH:35]=[CH:34][C:31]([CH2:32]Cl)=[CH:30][CH:29]=1>[I-].C([N+](CCCC)(CCCC)CCCC)CCC.C(OCC)C>[CH3:1][O:2][C:3]1[CH:8]=[C:7]([B:9]2[O:10][C:11]([CH3:17])([CH3:16])[C:12]([CH3:14])([CH3:15])[O:13]2)[CH:6]=[CH:5][C:4]=1[O:18][CH2:32][C:31]1[CH:34]=[CH:35][C:28]([O:27][CH3:26])=[CH:29][CH:30]=1

Participants

7

Reactant 4

HCID 6228DimethylformamideHCID 24758Sodium hydrideHCID 699934-Methyloxybenzyl chlorideHCID 27346502-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol

Product 1

HCID 670612332-[3-Methoxy-4-[(4-methoxyphenyl)methoxy]phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneYield 100%

Reagents, catalysts & solvents 2

HCID 67553Tetrabutylammonium IodideCatalystHCID 3283Diethyl EtherSolvent

Procedure

2-[3-Methoxy-4-(4-methoxy-benzyloxy)-phenyl]-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane was prepared as follows. To a flame-dried 50 ml round bottomed flask were added 2-methoxy-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenol (1.00 g, 4.00 mmol) and anhydrous DMF (20 ml). Sodium hydride (251 mg, 6.29 mmol; 60% dispersion in mineral oil) was added in three portions, and the suspension was stirred under nitrogen for 30 minutes para-Methoxy benzyl chloride (655 μl, 3.62 mmol) and tetrabutyl ammonium iodide (10 mg, 0.03 mmol) were added, and the reaction mixture was stirred for an additional 16 hours. The reaction mixture was concentrated, then cooled in an ice-bath, and 50 ml of 1 M citric acid was added followed by 100 ml ethyl acetate. The layers were separated, and the aqueous phase was extracted three times with ethyl acetate. The combined organic fractions were washed with brine, dried (Na2SO4), filtered and concentrated to give a tan powder. Trituration with diethyl ether gave 1.34 g (91%) of 2-[3-Methoxy-4-(4-methoxy-benzyloxy)-phenyl]-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane as a tan powder. 1H-NMR (CDCl3) δ=7.35 (m, 2H), 7.29 (s, 1H), 7.26 (s, 1H), 6.89(m, 3H), 5.11(s, 2H), 3.91 (s, 3H), 3.80 (s, 3H), 1.33 (s, 12H); MS m/z: 393 [M+Na]+.

Workup

  1. custom2-[3-Methoxy-4-(4-methoxy-benzyloxy)-phenyl]-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane was prepared
  2. additionwere added
  3. concentrationThe reaction mixture was concentrated
  4. temperaturecooled in an ice-bath
  5. addition50 ml of 1 M citric acid was added
  6. customThe layers were separated
  7. extractionthe aqueous phase was extracted three times with ethyl acetate
  8. washThe combined organic fractions were washed with brine
  9. dry with materialdried (Na2SO4)
  10. filtrationfiltered
  11. concentrationconcentrated
  12. customto give a tan powder

Sources & evidence

ORD record
ord-1dbdb93268794529a4aaabaa2fe792b7
Source dataset
uspto-grants-2008_04
Patent number
US07361763B2

Reaction notes

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