Dimethylformamide → HCID 20361819, compound

Participants

Reaction Steps

Ethyl 7-hydroxy-1,2,4-triazolo [1,5-a]pyrimidine-6-carboxylate (10.4g, 50mM), potassium carbonate (7.0g, 50mM), ethyl iodide (8.0ml, 15mM), dry dimethylformamide (80ml) and hexamethylphosphorotriamide (80ml) was heated at 80° C for 4 hours. The resulting mixture was evaporated in vacuo and water added (100ml). The solution was washed with ether (5 × 100ml) then extracted with ethyl acetate (10 × 100ml). The ethyl acetate extracts were dried over magnesium sulphate, filtered and evaporated in vacuo. The crystals were filtered off and recrystallised from ethyl acetate. 37.9% yield (4.47g); mpt 129° - 131° C. δ (CDCl3) 8.62 (1H,s) and 8.12 (1H,s), ##STR55## 4.47 (2H,q) and 4.38 (2H,q), (OCH2CH3 and NCH2CH3), 1.62 (3H,t) and 1.50 (3H,t), (OCH2CH3 and NCH2CH3); ν max (KBr) 3400 (broad) 1715, 1690, 1610, 1570, 1480, 1370, 1325, 1210, 1175, 790cm-1 ; λmax (EtOH) 209 (εm 12,400), 252 (εm 8,260) and 290 (εm 11,800)nm.

Provenance & Evidence