Heteroannulation of chromene derivatives. Synthesis of chromeno[4,3-<i>e</i>] indazolone chromeno[4,3-<i>f</i>]quinazoline and pyrano[3,2-<i>c</i>]chromene derivatives
作者:Mahmoud R. Mahmoud、Fakhry A. El-Bassiouny、Mohamed E. Azab、Mohamed Y. El-Kady、Hesham M. Rashed
DOI:10.3184/030823409x393727
日期:2009.1
2-amino-4-(4-methoxyphenyl)-5-oxo-4,5-dihydro-pyrano[3,2-c]chromene-3-carboxylate (9a) and the corresponding 3-carbonitrile 9b were prepared, and the reactions of the ester 9a with phenacyl chloride, furoyl chloride, and hydrazine hydrate were investigated.
Pentane-2,4-dione 和 3-ethoxycarbonylcoumarin 在乙醇钠的存在下反应形成 10-acetyl-7,9-dihydroxy-6H-benzo[c]chromen-6-one (2)。化合物 2 与芳香醛和氰基乙酸乙酯反应,分别得到色基-色内二酮 3 和 4,与水合肼反应形成吖嗪 5,苯肼得到色基-吲唑 6,与伯胺反应形成亚胺 7a-f,并用硫脲生成色基-喹唑啉 8. 2-氨基-4-(4-甲氧基苯基)-5-氧代-4,5-二氢-吡喃并[3,2-c]色烯-3-羧酸甲酯 (9a)制备了相应的3-腈9b,并研究了酯9a与苯甲酰氯、糠酰氯和水合肼的反应。