6-Methylanthranilic acid → 2-Methyl-6-[4-(5-methyl-2-phenyl-oxazol-4-ylmethoxy)-benzenesulfonylamino]-benzoic acid

Participants

Reaction Conditions

Reaction Steps

Sodium bicarbonate (159 mg, 1.89 mmol) and 2-amino-6-methylbenzoic acid (95.5 mg, 0.63 mmol) are dissolved in a mixture of 1 mL of THF and 1.5 mL of water and heated to 60° C. A solution of the title C compound, 4-(5-methyl-2-phenyl-oxazol-4-ylmethoxy)-benzenesulfonyl chloride (200 mg, 0.55 mmol) in 1 mL of THF is then added dropwise. The mixture is heated for an additional 2 h at 60° C., after which most of the THF is removed by passing a stream of nitrogen gas over the solution. The residue is partitioned between EtOAc and 1 N aqueous HCl. The organic phase is dried over anhydrous magnesium sulfate, filtered, and concentrated under vacuum to give crude product which is purified by chromatography on silica gel with an EtOAc (15%)-hexane (85%) mixture (containing 0.5% formic acid) as the eluent to give 2-methyl-6-[4-(5-methyl-2-phenyl-oxazol-4-ylmethoxy)-benzenesulfonylamino]-benzoic acid as a white solid: m.p. 167-170° C.; ESI-MS 479 [M+1]+.

Provenance & Evidence