A microwave-mediated synthesis of 1H-pyrazole-5-amines utilizing 1 M HCl at 150 °C was developed in order to provide products in a matter of minutes with minimal purification. Most reactions are complete in only 10 min and can be isolated via a simple filtration without the need for further purification by column chromatography or recrystallization. This method tolerates a range of functional groups and can be performed on milligram to gram scales.
Microwave synthesis of 1-aryl-1H-pyrazole-5-amines
Everson, N., Yniguez, K., Loop, L., Lazaro, H., Belanger, B., Koch, G., ... Eagon, S. (2019). Microwave synthesis of 1-aryl-1H-pyrazole-5-amines. Tetrahedron Letters, 60(1), 72-74. https://doi.org/10.1016/j.tetlet.2018.11.060