Diisopropylethylamine → 5-(3-Thienyl)[1,2,4]triazolo[1,5-a]pyridin-2-amine

Participants

Reaction Steps

A suspension of ethyl({[6-(3-thienyl)pyridin-2-yl]amino}carbonothioyl)carbamate (4.0 g; 13.01 mmol; 1.0 eq.), hydroxylamine hydrochloride (4.52 g; 65.1 mmol; 5.0 eq.) and DIEA (6.55 mL) in MeOH/EtOH (1:1, 120 mL) was stirred at rt for 2 hours and then at 70° C. for 3 hours. Solvents were removed under reduced pressure, the residue was taken up in dioxane/water (1:1) and filtered to give the title compound as a white powder (2.3 g; 82%). HPLC, Rt: 1.75 min. (purity 94.8%). LC/MS, M+(ESI): 217.3.

Provenance & Evidence