Hydrochloric Acid → HCID 69672849, compound

Participants

Reaction Steps

To a solution of 2,2,2-trifluoroethanimidamide (1.80 g, 13.6 mmol, Matrix) in ethanol (22 mL, 370 mmol) was added a solution of ethyl (3Z)-4-cyclobutyl-4-hydroxy-2-oxobut-3-enoate (2.7 g, 14 mmol, from Step A) in a small volume of ethanol. The solution was cooled in an ice bath and a solution of hydrogen chloride in ethanol (21 mL, 360 mmol, prepared by bubbling HCl gas through the ethanol for 10 minutes) was added. The reaction was allowed to warm to room temperature and stirred overnight. The mixture was added slowly to a saturated solution of sodium bicarbonate. Additional solid potassium carbonate was added. After neutralization was complete, ethanol was removed in vacuo. The product was extracted with three portions of DCM. The combined extracts were dried over sodium sulfate, filtered and evaporated. The product was purified by flash chromatography on silica gel, eluting with a gradient from 0-25% EtOAc/hexanes to afford a yellow oil (1.8 g, 48%). 1H NMR (400 MHz, CDCl3) δ 7.98 (s, 1H), 4.51 (q, J=7.1 Hz, 2H), 3.81 (p, J=8.6 Hz, 1H), 2.48-2.33 (m, 4H), 2.21-2.08 (m, 1H), 2.03-1.93 (m, 1H), 1.45 (t, J=7.1 Hz, 3H); LCMS (M+H)+: 275.1

Provenance & Evidence