反应详情

1,1-Dimethylethyl N-{2-[(3-amino[1,5]naphthyridin-4-yl)amino]ethyl}carbamate 0.6 g, 2 mmol), trimethyl orthovalerate (0.35 g, 2.1 mmol), and toluene (25 mL) were combined and heated at reflux for 2 hours. Additional trimethyl orthovalerate (1 eq.) was added and the reaction mixture was heated at reflux overnight. Xylene was added and the toluene was distilled off. The reaction was heated at reflux for an additional 8 hours. The bulk of the xylene was distilled off leaving a volume of about 5 mL. The reaction mixture was allowed to cool. The resulting precipitate was isolated by filtration, washed with heptane and dried to provide 0.35 g of 1,1-dimethylethyl N-[2-(2-butyl-1H-imidazo[4,5-c][1,5]naphthyridin-1-yl)ethyl]carbamate as an ivory powder, m.p. 198-199° C. Analysis: Calculated for C20H27N5O2: %C, 65.01; %H, 7.36; %N, 18.95. Found: %C, 64.75; %N, 7.57; %N, 19.09.

1. temperatureheated
2. temperatureat reflux for 2 hours
3. temperaturethe reaction mixture was heated
4. temperatureat reflux overnight
5. distillationthe toluene was distilled off
6. temperatureThe reaction was heated
7. temperatureat reflux for an additional 8 hours
8. distillationThe bulk of the xylene was distilled off
9. customleaving a volume of about 5 mL
10. temperatureto cool
11. customThe resulting precipitate was isolated by filtration
12. washwashed with heptane
13. customdried