Electric Literature of 82560-12-1,Some common heterocyclic compound, 82560-12-1, name is 3-Amino-5-tert-butylpyrazole, molecular formula is C7H13N3, 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.
A mixture of 2,4-dichloropyrimidine (3.73g, 25mmol) and 5-amino-3-tert-butyl-lH- pyrazole (3.55g, 25.5mmol) and DIPEA (4.44ml, 25mmol) were heated at 5O0C in TEtaF25 (75ml) for 18 hours under nitrogen. The mixture was allowed to cool and the volatiles removed by evaporation. The residue was dissolved in DCM (150ml), washed with water, dried (MgSO4) and the solvent removed by evaporation. The residue was purified by chromatography on silica gel eluting with EtOAc/hexanes (1:3) and then methanol/DCM (5:95) to give 2-chloro-4-(5-tert-butyl-lH-rhoyrazol-3-ylamino)rhoyrimidine (1.73g, 28%). NMR30 Spectrum 1.30 (s, 9Eta), 6.05 (s, IH), 7.16 (br s, IH), 8.12 (d, IH), 9.80 (br s, IH), 11.89 (br s, IH); Mass Spectrum 252 [MH]+.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3-Amino-5-tert-butylpyrazole, its application will become more common.