1-Bromo-2-butanone → 2-[4-(Benzyloxy)-3-propylphenyl]-4-ethyl-1,3-thiazole

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(benzyloxy)-3-propylbenzenecarbothioamide (0.53 g, 1.86 mmol) (Example 31) in EtOH (70 mL) was added 1-bromo-2-butanone (0.47 g, 2.79 mmol), and the reaction was stirred for 3 h at 70° C. After the reaction was complete, the reaction mixture was concentrated under reduced pressure and the residue was saved. This procedure was repeated on a 1.1 g scale (based on thioamide). The two crude residues were combined and purified by silica gel chromatography (EtOAc/hexane (v/v)=1:9, then 100% EtOAc) to give 0.87 g (67% overall) of the title compound. 1H NMR (400 MHz, CDCl3):δ 7.72 (s, 1H), 7.67 (d, 1H), 7.45-7.28 (m, 5H), 6.88 (d, 1H), 6.76 (s, 1H), 5.12 (s, 2H), 4.09 (q, 2H), 2.84 (q, 2H), 2.75-2.66 (m, 2H), 1.30 (t, 3H), 0.93 (t, 3H).

Provenance & Evidence