4-(4'-Methoxy-biphenyl-4-yloxymethyl)-5-methyl-furan-2-carboxylic acid → 4-Hydroxy-N-[4-(4'-methoxy-biphenyl-4-yloxymethyl)-5-methyl-furan-2-carbonyl]-benzenesulfonamide

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Reaction Steps

4-(4′-Methoxy-biphenyl-4-yloxymethyl)-5-methyl-furan-2-carboxylic acid (4) (50 mg) was reacted with acetic acid 4-sulphamoyl-phenyl ester (64 mg) in an analogous manner to that described in Example 2A. The acetic ester intermediate was hydrolysed with sodium methoxide (80 mg) in a mixture of methanol (10 mL) and water (1 mL) for 1 hour. The solution was concentrated in vacuo then partitioned between dichloromethane (10 mL) and water (10 mL). The organic layer was washed with brine (10 mL), dried, filtered and concentrated in vacuo. The crude product was purified by preparative HPLC (starting at 30% acetonitrile and increasing at a rate of 1% per minute up to 98% acetonitrile) to give compound 13 as a white solid (15 mg). LC/MS System C: Rt=3.50 mins, m/z (ES−)=492 (M− for C26H23N2O7S).

Provenance & Evidence