Toluene → HCID 23353221, compound

Participants

Reaction Conditions

Reaction Steps

Ethyl 3-aminothieno[2,3-b]pyrazine-2-carboxylate (0.500 g, 2.24 mmol) was dissolved in 15 ml THF under nitrogen. The solution was cooled to -78° C and dropwise treated with 4.9 ml 0.5M KHMDS in toluene (2.46 mmol). The resulting purple reaction mixture was allowed to warm to rt, treated with 2-iodopropane (0.46 s g, 2.69 mmol) and then brought to reflux for 48h. After the addition of 1 ml EtOH, the reaction mixture was concentrated and applied directly to a silica gel column. Elution with a solvent gradient from 10:1 to 4:1 hexanes: ethyl acetate gave the title compound (0.210 g, 35%). 1H NMR (300 MHz, CDCl3) δ1.30 (d, 6H), 1.40 (t, 3H), 4.37 (q, 2H), 5.27 (dh, 1H), 7.42 (br d, 1H), 8.55 (d, 1H), 8.58 (d, 1H). MS (DCI/NH3) m/e 266 (M+H).

Provenance & Evidence