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In a sealed tube were heated and stirred 2-chloro-6-methyl-3-(thiophene-2-carbonyl)pyridine and a 70% ethylamine aqueous solution. Thereafter, the reaction mixture was worked up and purified in a usual manner to obtain 2-ethylamino-6-methyl-3-(thiophene-2-carbonyl)pyridine. NMR1: 7.97 (1H, d, J=8.1 Hz), 7.62 (1H, dd, J=5.0, 1.1 Hz), 1.28 (3H, t, J=7.3 Hz).

1. temperatureIn a sealed tube were heated
2. custompurified in a usual manner