Imidazole → Methyl 4-(1-{4-[2-(t-butyldimethylsilanyloxy)-3,3-dimethyl-butoxy]-3-methylphenyl}-1-ethylpropyl)-2-methyl-benzoate

HRID 230809Notes

Reaction equation

HRID 230809 reaction equation
[OH:1][CH:2]([C:28]([CH3:31])([CH3:30])[CH3:29])[CH2:3][O:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]([C:16]2[CH:25]=[CH:24][C:19]([C:20]([O:22][CH3:23])=[O:21])=[C:18]([CH3:26])[CH:17]=2)([CH2:14][CH3:15])[CH2:12][CH3:13])=[CH:7][C:6]=1[CH3:27].N1C=CN=C1.[CH3:37][C:38]([Si:41](Cl)([CH3:43])[CH3:42])([CH3:40])[CH3:39]>CN(C=O)C>[Si:41]([O:1][CH:2]([C:28]([CH3:29])([CH3:31])[CH3:30])[CH2:3][O:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]([C:16]2[CH:25]=[CH:24][C:19]([C:20]([O:22][CH3:23])=[O:21])=[C:18]([CH3:26])[CH:17]=2)([CH2:12][CH3:13])[CH2:14][CH3:15])=[CH:7][C:6]=1[CH3:27])([C:38]([CH3:40])([CH3:39])[CH3:37])([CH3:43])[CH3:42]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 10320279Methyl 4-(1-{4-[2-(hydroxy)-3,3-dimethyl-butoxy]-3-methylphenyl}-1-ethylpropyl)-2-methylbenzoate

Product 1

HCID 57763479Methyl 4-(1-{4-[2-(t-butyldimethylsilanyloxy)-3,3-dimethyl-butoxy]-3-methylphenyl}-1-ethylpropyl)-2-methyl-benzoateYield 72%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of the methyl 4-(1-{4-[2-(hydroxy)-3,3-dimethyl-butoxy]-3-methylphenyl}-1-ethylpropyl)-2-methylbenzoate (4.79 g, 11.24 mmol), Example 1, in DMF (40 mL) is added imidazole (1.14 g, 16.87 mmol) followed by the addition of TBSCl (1.78 g, 11.80 mmol). The mixture is stirred at RT overnight and concentrated. The mixture is partitioned between 0.1 M HCl (100 mL) and EtOAc (100 mL). The aqueous layer is extracted with EtOAC. The combined organic layers is MgSO4 dried, concentrated, and chromatographed (10% EtOAc/Hex) to give the title compound (4.37 g, 72%).

Workup

  1. concentrationconcentrated
  2. customThe mixture is partitioned between 0.1 M HCl (100 mL) and EtOAc (100 mL)
  3. extractionThe aqueous layer is extracted with EtOAC
  4. customdried
  5. concentrationconcentrated
  6. customchromatographed (10% EtOAc/Hex)

Sources & evidence

ORD record
ord-ddca908e5a80451b8305d891dd7e9100
Source dataset
uspto-grants-2009_07
Patent number
US07566803B2

Reaction notes

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