p-Toluenesulfonic acid → 2-Pentenoic acid, 3-(3-pyridinylamino)-, methyl ester, (Z)-

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Reaktionsschritte

A mixture of 3-aminopyridine (5.0 g), methylpropionylacetate (7.6 g) and p-toluenesulphonic acid (0.5 g) was stirred for 96 hours and then ether (100 ml) was added. The solution was washed with water (100 ml) and dried (MgSO4). The solvent was removed by evaporation and the residue purified by flash chromatography, eluting with ethyl acetate to give methyl-(Z)-3-(3-pyridylamino)-2-pentenoate (B3) (2.8 g) as an oil; NMR (CDCl3): 1.1(t,3H), 2.5(q,2H), 3.7(s,3H), 4.95(s,1H), 7.3(m,1H), 7.4(m,1H), 8.4(m,2H), 10.3(br,1H).

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