References and Notes
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- For structure verification, a sample of crude (2) was purified by column chromatography on silica gel using 30% ethyl acetate/hexanes. Compound (2) was obtained as a tan solid, mp 68–69°C. 1H NMR (300 MHz, CDCl3): δ 12.0 (s, 1H), 7.4–6.7 (m, 14H), 5.2–5.0 (m, 3H), 3.3–3.2 (m, 2H). Anal. Calcd for C23H21NO4: C, 73.57, H, 5.64, N, 3.73, Found C, 73.36, H, 5.72, N, 3. 57