Triethylamine → 7-chloro-2-[1-(4-methoxy-benzyl)-5-pyrrolidin-1-yl-1H-[1,2,4]triazol-3-ylethynyl]-[1,2,4]triazolo[1,5-a]pyridine

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-ethynyl-1-(4-methoxybenzyl)-5-(pyrrolidin-1-yl)-1H-1,2,4-triazole (75 mg, 266 μmol, Eq: 1.00), 2-bromo-7-chloro-[1,2,4]triazolo[1,5-a]pyridine (67.9 mg, 292 μmol, Eq: 1.1) and triethylamine (40.3 mg, 55.5 μl, 398 μmol, Eq: 1.5) in tetrahydrofuran (2 ml) was purged with argon, then copper (I) iodide (1.01 mg, 5.31 μmol, Eq: 0.02), bis(triphenylphosphine) palladium(II) chloride (3.73 mg, 5.31 μmol, Eq: 0.02) and triphenylphosphine (1.39 mg, 5.31 μmol, Eq: 0.02) were added, the vessel was capped and heated for 18 hours to 75° C. Still starting material. The mixture was cooled, purged with argon and another portion of copper (I) iodide (1.01 mg, 5.31 μmol, Eq: 0.02), bis(triphenylphosphine) palladium(II) chloride (3.73 mg, 5.31 μmol, Eq: 0.02) and triphenylphosphine (1.39 mg, 5.31 μmol, Eq: 0.02) was added and the mixture was stirred again over night at 75° C. The crude material was applied on silicagel and purified by flash chromatography over a 20 g silicagel column using ethyl acetate/methanol 0-10% as eluent affording 7-chloro-2-[1-(4-methoxy-benzyl)-5-pyrrolidin-1-yl-1H-[1,2,4]triazol-3-ylethynyl]-[1,2,4]triazolo[1,5-a]pyridine (33 mg 26.8%) as an orange oil. MS: m/e=434.4 (M+H+)

Provenance & Evidence