反应详情

温度

70 °C

A solution of tert-butyl 4-(4-chloromethylthiazol-2-yl)piperazine-1-carboxylate (820 mg, 2.58 mmol) and methyl 4-hydroxybenzoate (395 mg, 2.58 mmol) in DMF was treated with potassium carbonate (360 mg, 2.6 mmol). The mixture was stirred at 70° C. for approximately 12 hours and then concentrated under vacuum. The residue was partitioned between ethyl acetate and water and the or organic phase was separated, washed with brine, dried over sodium sulfate and concentrated. The residue was crystallized from a mixture of ethyl acetate/hexanes to provide tert-butyl 4-[4-(4-methoxycarbonyl-phenoxymethyl)thiazol-2-yl]piperazine-1-carboxylate (830 mg, 74% yield). HNMR (dmso-d6): HNMR (dmso-d6): 7.91 (2H, d), 7.13 (2H, d), 6.91 (1H, s), 5.00 (2H, s), 3.81 (3H, s), 3.41 (8H, m), 1.41 (9H, s).

1. concentrationconcentrated under vacuum
2. customThe residue was partitioned between ethyl acetate and water
3. customthe or organic phase was separated
4. washwashed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated
7. customThe residue was crystallized from a mixture of ethyl acetate/hexanes