Reference of 35100-92-6,Some common heterocyclic compound, 35100-92-6, name is 1,5-Dimethyl-1H-pyrazol-3-amine, molecular formula is C5H9N3, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
Intermediate IVa (R)-tert-butyl 4-(2-chloro-4-(( 1 ,5 -dimethyl- 1 H-pyrazol-3 -yl)amino)pyrimidin-5 -yl)-2- methylpiperazine- 1 -carboxylate In a 25 mL Biotage microwave vial (R)-tert-butyl 4-(2,4-dichloropyrimidin-5-yl)-2- methylpiperazine-1 -carboxylate (500 mg, 1.44 mmol, Intermediate III ) and 1,5- dimethyl-lH-pyrazol-3 -amine (160 mg, 1.44 mmol, Princeton Bio.) was taken in ethanol (10 mL). N,N-diisopropylethylamine (0.754 mL, 4.32 mmol) was added and the reaction mass was subjected to microwave irradiation at 120 C for 4 hours. The reaction was monitored by LCMS and identified the required mass. Reaction mass was cooled and evaporated to dryness and the residue was then chromatographed with EtoAc/Hexane on silica to get pure solid of (R)-tert-butyl 4-(2-chloro-4-((l,5-dimethyl- lH-pyrazol-3-yl)amino)pyrimidin-5-yl)-2-methyl piperazine-l-carboxylate (300 mg, 49.4 %) MS (ES+), (M+H)+= 422.20 for Ci9H28ClN702
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 1,5-Dimethyl-1H-pyrazol-3-amine, its application will become more common.