反应详情

An aliquot of 4-[[4(aminoiminomethyl)phenyl]amino]-4-oxobutanoic acid hydrochloride prepared in Example 1, Step 1 (1.36 g) was added to dry DMF (50 ml) followed by N-methylmorpholine (0.6 mL) and isobutyl chloroformate (0.65 mL) at 0° C. under nitrogen atmosphere. The mixture was stirred for 5 min 0.45 g β-alanine ethyl ester hydrochloride was added followed by 0.6 mL of N-methyl morpholine. After 4 hr the solvent was removed under reduced pressure and the product was purified by reverse phase chromatography (water/acetonitrile) to give 4.4 g of white solid: 1H NMR (d6 -DMSO) δ 1.2 (t, 3H, J=7 Hz), 2.45 (m, 4H), 2.6 (m, 2H), 3.25 (m, 2H), 4.05 (q, 2H, J=7 Hz), 7.8 (s, 4H), 8.0 (m, 1H), 8.85 (bs, 2H), 9.18 (bs, 2H), 10.4 (s, 1H); MS (ES) m/e 335.1(M+H+).

1. additionwas added
2. customAfter 4 hr the solvent was removed under reduced pressure
3. customthe product was purified by reverse phase chromatography (water/acetonitrile)