Ammonia → 6-Ethyl-3-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-1,2,4-triazine-5-amine

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Reaction Steps

1.800 g (5.138 mmol) of 6-ethyl-3-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-1,2,4-triazin-5-ol were admixed with 25 ml of phosphoryl chloride and stirred overnight at RT. The reaction mixture was diluted with 100 ml of dry acetonitrile and, with ice-cooling, stirred into 375 ml of concentrated aqueous ammonia solution (25% strength). Stirring was carried out for 4 h at RT. Concentration on a rotary evaporator was carried out and the residue was partitioned between water and ethyl acetate. The organic phase was dried over sodium sulphate and concentrated on a rotary evaporator. The residue was purified by preparative HPLC (mobile phase: acetonitrile/water with 0.1% TFA, gradient 30:70→95:5). This gave 157 mg (8% of theory) of the target compound.

Provenance & Evidence