3-[3-(3-Methyl-1-{2-[4-(3-o-tolyl-ureido)-phenyl]-acetylamino}-butyl)-isoxazol-5-yl]-propionic acid methyl ester → 3-[3-(3-Methyl-1-{2-[4-(3-o-tolyl-ureido)-phenyl]-acetylamino}-butyl)-isoxazol-5-yl]-propionic acid

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A mixture of 3-[3-(3-methyl-1-{2-[4-(3-o-tolyl-ureido)-phenyl]-acetylamino}-butyl)-isoxazol-5-yl]-propionic acid methyl ester (17 mg) in tert-BuOH (1 ml) and 0.1 N NaOH (1 ml) was stirred at room temperature. After 20 h the mixture was concentrated under reduced pressure, dissolved in water (5 ml) and extracted with EtOAc (5 ml×3). The aqueous layer was then acidified to pH 3 with IN HCl and extracted with EtOAc. The combined organics were washed with brine; dried over Na2SO4; filtered and concentrated under reduced pressure to give the title compound as a white amorphous solid. MP=?; MS [M+1]+493.2; 1H nmr (400 MHz, CD3OD) δ0.87 (d, 3H), 0.91 (d, 3H), 1.53-1.66 (m, 3H), 2.26 (s, 3H), 2.64 (t, J=7.4 Hz, 2H), 2.97 (t, J=7.5 Hz, 2H), 3.44 (s, 2H), 5.08 (m, 1H), 6.00 (s, 1H), 6.99 (t, 1H), 7.11-7.36 (m, 6H), 7.59 (d, J=7.9 Hz,1H).

Provenance & Evidence