Triphenylphosphine → Ethyl 2,5-dimethyl-7-[(2,3,6-trifluorobenzyl)oxy]pyrazolo[1,5-a]pyridine-3-carboxylate

Beteiligte Stoffe

Reaktionsschritte

1.2 g (5.25 mmol) of ethyl 7-hydroxy-2,5-dimethylpyrazolo[1,5-a]pyridine-3-carboxylate from Example 8A were dissolved in 48 ml of THF. 1.7 g (10.50 mmol) of 2,3,6-trifluorobenzyl alcohol and 2.9 g (11.03 mmol) of triphenylphosphine were added. Subsequently, 2.2 ml (11.03 mmol) of diisopropyl (E)-diazene-1,2-dicarboxylate were added to the solution, which was stirred at RT for 1 h. 120 ml of tert-butyl methyl ether were added, then the mixture was stirred briefly, and the solids formed were filtered off and dried under high vacuum. 1.2 g of the target compound were obtained (62% of theory).

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