Trityl chloride → 5-Amino-1-[2-(trityloxy)ethyl]pyrazole-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a suspension of 5-amino-1-(2-hydroxyethyl)pyrazole-4-carbonitrile (10 g, 65.7 mmol) and pyridine (100 ml) was added triphenylmethyl chloride (22.3 g, 78.9 mmol) at room temperature. After stirring at 60° C. for 6 hours, the reaction mixture was concentrated in vacuo. To the residue were added tetrahydrofuran and brine, and the separated organic layer was washed with brine. The extract was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was triturated with ethyl acetate to give 5-amino-1-[2-(trityloxy)ethyl]pyrazole-4-carbonitrile (25.4 g) as a colorless solid.

Provenance & Evidence