Ammonia → 7-(2-Aminoethylamino)-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo[1,5-a] pyrimidine

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Reaction Steps

Dissolve 7-chloro-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo[1,5-a] pyrimidine in 25 mL CH3CN, then add excess ethylenediamine (5 mL) and heat to 80° C. for 3-6 h under N2 with attached reflux condenser. (TLC; product diamine Rf=0.5, aryl chloride Rf=1.0; [10% (2.0M NH3 in MeOH)/90% CH2Cl2] as eluent). Cool to ambient temperature and evaporate to yellow oil. Partition between CH2Cl2 (50 mL) and 1.0 N NaOH (50 mL), and extract aqueous layer 2×30 mL CH2Cl2. Pool organic layers, dry over Na2SO4, filter and evaporate to yellow-white foam (1.25 g). Use without further purification. LCMS=344.4 (MH+); 342.3 (M−).

Provenance & Evidence