2-Fluoro-6-methoxybenzonitrile → 2-Methoxy-6-(pyrazol-1-yl)-benzonitrile

Beteiligte Stoffe

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Reaktionsschritte

At 50° C. and under a nitrogen blanket, a solution of 0.273 mol of sodium pyrazolide (prepared from equimolar amounts of pyrazole and sodium hydride) in 140 ml of N,N-dimethylethyleneurea is dripped into a solution of 41,2 g (0.273 mol) of 2-methoxy-6-fluorobenzonitrile (preparation: J. Heterocycl. Chem., 25, 1173, 1988) in 50 mi of N, N-dimethylethyleneurea, and the mixture is stirred for 2 hours at 60° C. The batch is cooled and stirred into 4 liters of ice water, and the crystals which precipitate are suction filtered and dried; there is obtained 37.1 g of the product of m.p. 93°-94° C.

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