Friedländer reaction of 3-acetyltropolones: Synthesis of naphthyridinyl- and allied heterocyclic-substituted tropolones
作者:Ming-Zhu Piao、Kimiaki Imafuku
DOI:10.1002/jhet.5570330230
日期:1996.3
Five 3-acetyltropolones reacted with 2-amino-3-pyridinecarbaldehyde to afford the corresponding 3-(1,8-naphthyridin-2-yl)tropolones in excellent yields. In a similar manner, 1,6-naphthyridin-2-yl-,1,7-naphthyridin-2-yl-, 6-pyrido[2,3-b]pyrazinyl-, and 1-methyl-6-pyrazolo[5,4-b]pyridyl-substituted tropolones were prepared. Reactivities of amino-substituted heteroarenecarbaldehydes in these reactions
五个3-乙酰基
丙酮酮与
2-氨基-3-吡啶甲醛反应,以极好的收率得到相应的3-(
1,8-萘啶-2-基)托洛酮。以类似的方式,1,6-
萘啶-2-基-,
1,7-萘啶-2-基-,6-
吡啶基[2,3- b ]
吡嗪基-和1-甲基-6-
吡唑并[5 ,4- b制备]
吡啶基取代的tropolones。还讨论了这些反应中
氨基取代的杂亚芳基
甲醛的反应性和产物的性质。