Compound 16 was obtained in 78% total yield; m.p. 151–153°C; TLC (petroleum ether/ethyl acetate 4/6); Rf = 0.47; 1H-NMR (200 MHz, DMSO-d 6) δ: 8.03 (1H, d, J = 8.4, H-4), 7.81 (1H, d, J = 8.4, H-7), 7.50 (1H, t, H-5), 7.41 (1H, t, H-6) 7.07 (2H, d, J = 8.2, H-3′,5′), 6.49 (2H, d, J = 8.2, H-2′,6′), 5.74 (2H, s, CH2), 5.15 (2H, s, NH2). 13C-NMR (DMSO-d 6) δ: 149.2 (C), 145.5 (C), 132.4 (C), 132.8 (C), 128.7 (2CH), 126.6 (2CH), 119.7 (CH), 114.6 (2CH), 110.3 (CH), 52.3 (CH2).
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