nicotinic acid, potassium salt → 1-(1,3,7-Trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)ethyl pyridine-3-carboxylate

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2.57 g of 8-α-chloroethylcaffeine are dissolved in 25 ml of anhydrous dimethylformamide, to which 2.98 g of dry potassium nicotinate are added. The mixture is heated under shaking at 100° C for 1 hour, then filtered off and the filtrate evaporated under reduced pressure. The residue, after washing with water, gives 3.1 g of slightly crude product which is purified by crystallization from 95% ethanol : m.p. (EtOH) 160° C. The monohydrochloride melts at 200°-210° C.

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