Methionin AL → 6-(3,5-Dimethylbenzyl)-5-isopropyluracil

Beteiligte Stoffe

Reaktionsschritte

Metal sodium (23.8 g, 1.034 mol) was reacted with anhydrous ethanol (500 ml). To the clear obtained solution, was added thiourea (54.35 g, 714 mmol) and ethyl 3-methyl-2(3,5-dimethylphenylacetyl)butanoate (13.14 g, 47.6 mol). The reaction medium was maintained under reflux for 6 h, and then was concentrated in vacuo at 40.50° C. To the obtained residue was added concentrated hydrochloric acid (100 ml) and then the solution was brought to pH 4 with acetic acid. The obtained 6-dimethylbenzyl-5-isopropyl-2-thiouracil was dissolved in an aqueous 10% chloroacetic acid solution (200 ml) and the solution was maintained under reflux for 24 h and then cooled to ambient temperature and the obtained precipitates were separated by filtration and washed with cold ethanol and then with ether, and then dried in vacuo at 40° C. to give 6-(3,5-dimethylbenzyl)-5-isopropyluracil (7 g, 54%). Melting point: 213-214° C.

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