3-Aminophenylboronic acid → 2-(3,4,5-Trimethoxyphenylamino)-6-(3-aminophenyl)pyrazine

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Using Method C with 1.0 g (3.4 mmol) 2a and 635 mg (4.1 mmol) 3-aminophenyl boronic acid, 463 mg pure title compound were obtained. The filtrate was submitted to purification by preparative HPLC (eluent:AcOEt) and another fraction of 412 mg was obtained. A total of 875 mg CJS 364 (72.9%) were obtained. Reaction time: 28 hours. 1H-NMR (DMSO), δ (ppm), J (Hz): 3.64 (s, 3H, CH3O(4′)), 3.81 (s, 6H, CH3O(3′+5′)), 5.19 (s, 2H, NH2), 6.66 (d, 1H, Harom 4′, J=7.70), 7.13 (t, 1H, Harom 5′, J=7.77), 7.22 (d, 1H, Harom 6′), 7.26 (s, 2H, Harom(2+6)), 7.29 (s, 1H, Harom 2′), 8.11 (s, 1H, HP5), 8.33 (s, 1H, HP3), 9.51 (s, 1H, NHamine);

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