Diisopropylamine → 4-Tert-butyl-2-(carboxymethyl)benzoic acid

HRID 2236489Notes

Reaction equation

C(NC(C)C)(C)C.[Li]CCCC.[C:13]([C:17]1[CH:25]=[CH:24][C:20]([C:21]([OH:23])=[O:22])=[C:19]([CH3:26])[CH:18]=1)([CH3:16])([CH3:15])[CH3:14].C[O:28][C:29](=O)[O:30]C>C1COCC1>[C:13]([C:17]1[CH:25]=[CH:24][C:20]([C:21]([OH:23])=[O:22])=[C:19]([CH2:26][C:29]([OH:30])=[O:28])[CH:18]=1)([CH3:16])([CH3:15])[CH3:14]

Participants

Conditions

Temperature: -78 °C

Procedure

To a magnetically stirred solution of diisopropyl amine (0.75 g, 7.4 mmol) in THF (5 mL) at −30° C. is added BuLi (3.4 mL, 2.5 M in hexanes, 8.5 mmol). The mixture is stirred for 10 minutes at this temperature and cooled to −78° C. A solution of 4-tert-Butyl-2-methyl-benzoic acid [J. Am. Chem. Soc. 1944, 66, 154] (250 mg, 1.3 mmol) and dimethylcarbonate (150 mg, 1.67 mmol) in THF (3 mL) is added dropwise at −78° C. The mixture is allowed to stir at this temperature for 2 hours before it is allowed to warm to room temperature. The mixture is quenched with MeOH and water once it reached room temperature. After removal of THF, the water layer is extracted with ether. The water layer is acidified with HCl and the product is extracted from ether. After chromatography, the title compound is isolated pure (125 mg, 41%). MS (ESI): 237.1 (M+1)+1.

Workup

stirringto stir at this temperature for 2 hours before it
temperatureto warm to room temperature
customThe mixture is quenched with MeOH and water once it
customreached room temperature
customAfter removal of THF
extractionthe water layer is extracted with ether
extractionthe product is extracted from ether

Sources & evidence

ORD record: ord-f601c3286c17427caa1a2505a2a7ef38
Source dataset: uspto-grants-2010_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07713994B2

Reaction notes

Loading…