1,2-Dichloroethane → 3-(3,4-Dimethoxyphenyl)propynoic acid (6-amino-1-ethyl-3-prop-2-ynyl-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-yl)amide

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Reaction Steps

A mixture of the 5,6-diamino-1-ethyl-3-propargyluracil (4.2 g, 20 mmol), 3,4-dimethoxyphenylacetylencarboxylic acid (4.2 g, 20 mmol) and EDC ((1-(3-dimethylaminopropyl)-3-ethyl-carbodiimid hydrochloride; 4.2 g, 22 mmol) in methanol (100 ml) was stirred at room temperature for 2 h. The colorless product was precipitated by adding water (ca. 150 ml), filtered under reduced pressure, washed thoroughly with ether (TLC-control indicated the purity of the product; eluent: dichloromethane/methanol 9:1) and dried at 60° C. Yield: 6 g (76%).

Provenance & Evidence