The product from Example 45A (0.085 g, 0.75 mmol), 3nitro-4-chlorobenzaldehyde(0.14 g, 0.75 mmol) and 2H-pyran-3,5(4H,6H)-dione (0.085 g, 0.75 mmol) were heated in 2 mL of ethanol for 2 days. The resulting mixture was allowed to cool to ambient temperature and filtered to provide the title compound as the filter cake (0.09 g). 1H NMR (300 MHz, DMSO-d6) δ 3.28 (s, 3H), 4.06 (s, 2H), 4.58 (s, 2H), 4.88 (s, 1H), 7.6 (dd, 1H), 7.7 (d, 1H), 7.9 (d, 1H), 10.8 (s, 1H); MS (ESI) m/z 376 (M−H)−; Anal. Calcd for C16H12N3ClO6: C, 50.88;H, 3.20; N, 11.12. Found: C, 50.86;H, 3.63; N, 10.52.
