Cl[C:2]1[C:3]([C:8]2[CH:13]=[C:12]([S:14][CH3:15])[N:11]=[C:10]([CH3:16])[N:9]=2)=[N:4][CH:5]=[CH:6][N:7]=1.[NH:17]1[C:25]2[CH:24]=[CH:23][CH:22]=[C:21]([NH2:26])[C:20]=2[CH:19]=[N:18]1>C(O)C.C([O-])(O)=O.[Na+]>[CH3:16][C:10]1[N:9]=[C:8]([C:3]2[C:2]([NH:26][C:21]3[C:20]4[CH:19]=[N:18][NH:17][C:25]=4[CH:24]=[CH:23][CH:22]=3)=[N:7][CH:6]=[CH:5][N:4]=2)[CH:13]=[C:12]([S:14][CH3:15])[N:11]=1A glass microwave reaction vessel was charged with 4-(3-chloropyrazin-2-yl)-2-methyl-6-(methylthio)pyrimidine (60 mg, 0.237 mmol) and 1H-indazol-4-amine (63.2 mg, 0.475 mmol, Bionet) in ethanol (2 mL). The reaction mixture was stirred and heated in an Emrys Optmizer microwave reactor (Personal Chemistry, Biotage AB, Inc., Upssala, Sweden) at 160° C. for 30 min. The reaction mixture was diluted with saturated NaHCO3 (5 mL) and extracted with EtOAc (2×30 mL). The combined organic extracts were washed with saturated NaCl (5 mL) and dried over Na2SO4. The solution was filtered and concentrated in vacuo to give a yellow solid. The crude material was adsorbed onto a plug of silica gel and purified by chromatography through a silica gel column eluting with 40% EtOAc/hexanes to provide N-(3-(2-methyl-6-(methylthio)pyrimidin-4-yl)pyrazin-2-yl)-1H-indazol-4-amine (38 mg, 46% yield) as yellow solid. 1H NMR (300 MHz, d8-dioxane) δ 12.49 (s, 1H); 11.68 (s, 1H); 10.69 (s, 1H); 8.24 (s, 2H); 8.10 (d, J=7.60 Hz, 1H); 8.02 (s, 1H); 7.23 (t, J=7.97 Hz, 1H); 7.07 (d, J=8.18 Hz, 1H); 2.83 (s, 3H); 2.53 (s, 3H). m/z (ESI, +ve ion) 350 (M+H)+.
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