... The Journal of Organic ... this table are isolated yields after silica gel chromatography or reverse phase HPLC.1,3,5- substituted regioisomers were confirmed by 15 N HMBC and ... 1 H NMR (500 MHz, DMSO) δ 8.05 (d, J = 7.0 Hz, 2H), 7.62 (d, J = 7.7 Hz, 2H), 7.51−7.40 (m, 3H), 7.13 ...