Ethyl 4,4,4-trifluoro-2-butynoate → 3-(2,6-Dichloro-phenyl)-5-trifluoromethyl-3H-[1,2,3]triazole-4-carboxylic Acid Ethyl Ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-azido-1,3-dichloro-benzene (25.0 g, 132.9 mmol) and 4,4,4-trifluoro-but-2-ynoic acid ethyl ester (26.5 g, 159.6 mmol) in toluene (30 mL) are heated at 80° C. for 18 h. A large exotherm is observed at 25 minutes. The reaction is removed from heat until exotherm subsides. Two regioisomers are observed in a range of 1:1 to 3:1 in favor of the desired product. The reaction mixture is concentrated under reduced pressure to 51 g of crude material and purified via column chromatography using a gradient of 35-60% DCM in Hexanes to yield the title compound (28 g, 59%). ES/MS m/z 353.0 (M+1).

Provenance & Evidence