Triethylamine → tert-Butyl 4-(4-((4-((2-(2-methoxy-2-oxoethyl)phenyl)ethynyl)-5-(trifluoromethyl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a nitrogen de-gassed solution of methyl 2-(2-ethynylphenyl)acetate (I4: prepared according to the procedure of Peng, C. et al; Adv. Synth. Catal. 2008, 350, 2359-2364 or as detailed below) (0.114 g, 0.653 mmol) in dry DMF (6 mL) were added triethylamine (0.280 mL, 2.01 mmol) followed by tert-butyl 4-(4-((4-chloro-5-(trifluoromethyl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate (I3) (0.230 g, 0.502 mmol), triphenylphosphine (0.020 g, 0.075 mmol), trans-dichlorobis(triphenylphosphine) palladium(II) (0.035 g, 0.050 mmol) and CuI (0.014 g, 0.075 mmol). The reaction mixture was heated under microwave irradiation at 120° C. for 20 minutes and then concentrated to dryness in vacuo and purified by silica gel chromatography (Biotage Isolera, 40 g Si cartridge, 0-80% EtOAc in cyclohexane) to give the title compound (I5) (0.267 g, 89% yield) as an orange glassy solid; 1H NMR (400 MHz, d5-DMSO) δ 10.27 (br s, 1H), 8.76 (s, 1H), 7.65-7.49 (m, 4H), 7.49-7.38 (m, 2H), 6.95 (d, J=9.1 Hz, 2H), 3.94 (s, 2H), 3.61 (s, 3H), 3.51-3.42 (m, 4H), 3.09-3.00 (m, 4H), 1.42 (s, 9H). LCMS Method C: rt 6.67 min; m/z 596.3 [M+H]+.

Provenance & Evidence