Study on Synthesis of Heterocycle-Fused Troponoid Compounds

3-Acetyltropolone 1 reacted with 3,4,5-trimethoxybenzaldehyde et al. to afford 2～5. 2-Acetyl-7-methylaminotropone 7 reacted with 3,4,5-trimethoxybenzaldehyde et al. to gave 8～10. Compound 1 reacted with 3,4,5-trimethoxybenzaldehyde in the presence of ethyl orthoformate and perchloric acid to afford 6. Compounds 3,5 reacted with hydroxylamine to give 11, 12. The reactions of 3,5 with phenylhydrazine gave 13, 14.