Acetic Acid → Ethyl 3-(4-methyl-1,3-thiazol-2-yl)-3-oxopropanoate

Participants

Reaction Conditions

Reaction Steps

NaH (60% in oil, 1.34 g, 33.5 mmol) was washed with isohexane (2×14 mL), suspended in toluene (25 mL), treated with diethyl carbonate (4.7 mL, 4.6 g, 38.8 mmol), heated to 80° C., treated dropwise over 20 min with a solution of 2-acetyl-4-methylthiazole (2.72 g, 19.2 mmol) in toluene (5 mL) and stirred at 80° C. for 2 h. The mixture was cooled to 0° C., treated dropwise with HOAc (4.65 mL, 4.9 g, 81 mmol) followed by ice (25 g) and water (50 mL) and stirred for 30 min. The aqueous phase was extracted with toluene (50 mL), the combined organic phase was washed with water (50 mL), dried (MgSO4) and concentrated in vacuo to give the crude product (3 g, 74%) as a dark red oil, used in the next step without further purification; NMR δH (400 MHz, CDCl3) 1.26 (3H, t, J 7.2 Hz), 2.92 (3H, s), 4.14 (2H, s), 4.18-4.25 (2H, m) and 7.31 (1H, s).

Provenance & Evidence