Triethylamine → HCID 86629366, compound

Participants

Reaction Steps

4,6-Dichloro-1-methyl-1H-pyrazolo[3,4-d]pyrimidine (0.5 g, 2.46 mmol), Et3N (1.05 mL, 7.5 mmol) and 6,8-dioxa-3-azabicyclo[3.2.1]octane hydrochloride (373 mg) in CH2Cl2 (5 mL) is stirred for 18 h. Concentration in vacuo followed by silica gel chromatography (hexane/ethyl acetate) gives 3-(6-chloro-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-6,8-dioxa-3-azabicyclo[3.2.1]octane as a white powder (320 mg). This material (0.16 g, 0.57 mmol) was treated with 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (0.186 g, 0.85 mmol), aq. Na2CO3 (0.425 mL, 2M), and tetrakis triphenylphosphine palladium (20 mg) in 1:1 toluene:ethanol. The reaction mixture was heated in a microwave at 120 C for 20 min to give 4-(4-(6,8-dioxa-3-azabicyclo[3.2.1]octan-3-yl)-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-6-yl)aniline. To this material (190 mg, 0.56 mmol) in CH2Cl2 is added Et3N (0.42 mL) and a solution of triphosgene (83 mg, 0.28 mmol) in CH2Cl2. After 30 min half of the solution is added to 3-aminopyridine (105 mg, 1.12 mmol). After 2 h aq. workup and silica gel chromatography (EtOAc/MeOH) gives the title compound as an off-white solid (104 mg). HRMS m/z=459.1894 (M+H).

Provenance & Evidence