反应详情

500 mg (3.84 mmol) 5-fluorouracil were dissolved in 100 ml of tetrahydrofuran and diluted with 505 mg (696 μl; 4.99 mmol) of triethylamine. To this solution, 1016 mg (4.99 mmol) of 2-maleinimidoethyl chloroformate, dissolved in 100 ml of tetrahydrofuran, were added drop-wise and the set-up was stirred for 15 h at room temperature. Then, the solvent was removed under the water jet vacuum and the residue purified using column chromatography (LOBAR®-column; running medium: acetic acid/hexane 1.5/1; yield: 61%); melting point: 132° C., Rf-value: 0.64 (diol; acetic acid/hexane 2/1)

1. additionwere added drop-wise
2. customThen, the solvent was removed under the water jet vacuum
3. customthe residue purified