1: 3,7-dimethyl xanthine With potassium carbonate in N,N-dimethyl-formamide Reflux; 2: 2-hydroxy-1-iodoethane 18 h; Reflux;
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N-ethyl-N,N-diisopropylamine in acetonitrile T=70°C; 16 h;
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Location in patent: Paragraph 0122 ;