反应详情

A mixture of 0.42 g (1.9 mmol) of 3H-furo[2,3-f]benzoxazole-2-one-6-carboxylic acid, 0.3 ml (2.1 mmol) of triethylamine, 0.35 ml (2.0 mmol) of 4-benzylpiperidine, 0.76 g (2.0 mmol) of HBTU (Advanced Chem. Tech.) and 10 ml of dimethylformamide is stirred at room temperature for 6 h. The reaction mixture is concentrated and the residue is purified by column chromatography using Kieselgel 60 as adsorbent (Merck) and toluene:aceton=2:1 as eluent, then the product is crystallized with diethylether to yield 0.39 g (54%) of the title compound. Mp.: 205-210° C. (diethyl ether).

1. concentrationThe reaction mixture is concentrated
2. customthe residue is purified by column chromatography
3. customaceton=2:1 as eluent, then the product is crystallized with diethylether