反应详情

A stirred mixture of 5,6-dichloro-2-methyl-4-pyrimidinol (1.20 g, 6.70 mmol) and 5-aminomethyl-3-bromopyridine (3.65 g, 19.5 mmol) in dimethoxyethane (25 mL) was heated at reflux for 14 hours. The mixture was then concentrated in vacuo and diluted with water. The precipitate was isolated by filtration with aqueous rinse, recrystallized twice from ethyl acetate, and then recrystallized a third time, but from methanol, to provide the title compound as a pure product (1.07 g, 3.25 mmol, 48%): mp 274°-275° C.; Rf 0.59 (20% MeOH in EtOAc); 1H NMR (DMSO-D6, 400 MHz)δ11.9 (br s, 1H), 8.57 (d, J=2 Hz, 1H), 8.49 (s, 1H), 7.93 (s, 1H), 7.46 (t, J=6 Hz, 1H), 4.56 (d, J=6.1 Hz, 2H), 2.18 (s, 3H); IR (KBr) 3300 (NH), 2790-3000 (CH), 1660, 1615, 2590 (C=C, C=N); mass spectrum m/e 329.8 (M+, 70%), 292.9 (M+ -Cl, 32%).

1. temperaturewas heated
2. temperatureat reflux for 14 hours
3. concentrationThe mixture was then concentrated in vacuo
4. additiondiluted with water
5. customThe precipitate was isolated by filtration with aqueous rinse
6. customrecrystallized twice from ethyl acetate
7. customrecrystallized a third time