Isopropanol → 4-Acetoxy-2-isopropoxy-benzoic acid methyl ester

HRID 1008651Notes

Reaction equation

HRID 1008651 reaction equation
[CH:1](O)([CH3:3])[CH3:2].[CH3:5][O:6][C:7](=[O:19])[C:8]1[CH:13]=[CH:12][C:11]([O:14][C:15](=[O:17])[CH3:16])=[CH:10][C:9]=1[OH:18].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CCOC(/N=N/C(OCC)=O)=O>ClCCl>[CH3:5][O:6][C:7](=[O:19])[C:8]1[CH:13]=[CH:12][C:11]([O:14][C:15](=[O:17])[CH3:16])=[CH:10][C:9]=1[O:18][CH:1]([CH3:3])[CH3:2]

Participants

6

Reactant 4

HCID 3776IsopropanolHCID 11776TriphenylphosphineHCID 5462977Diethyl azodicarboxylateHCID 579902174-Acetoxy-2-hydroxy-benzoic acid methyl ester

Product 1

HCID 670554964-Acetoxy-2-isopropoxy-benzoic acid methyl esterYield 79%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Isopropanol (0.63 mL, 8.2 mmol) was added to a mixture of 4-Acetoxy-2-methoxy-benzoic acid methyl ester (Step 1, Example 299, 1.18 g, 5.6 mmol), Ph3P (1.84 g, 7.0 mmol), and dichloromethane (15 mL). Then DEAD (1.12 mL, 7.1 mmol) was added to the reaction. Reaction was stirred at room temperature for two days. Reaction solution was concentrated by rotary evaporation and the resulting residue was purified with silica gel prep plates and 1:5 EtOAc/Hexane as eluent. Obtained 1.11 g of 4-Acetoxy-2-isopropoxy-benzoic acid methyl ester in 79% yield.

Workup

  1. customReaction
  2. customReaction solution
  3. concentrationwas concentrated by rotary evaporation
  4. customthe resulting residue was purified with silica gel prep plates and 1:5 EtOAc/Hexane as eluent

Sources & evidence

ORD record
ord-7ea0aa461e8d4aa399dc41dfb463674c
Source dataset
uspto-grants-2004_09
Patent number
US06797708B2

Reaction notes

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