Substituted Benzopyranopyridine and Pyrimidine Ring Syntheses by the Ternary Condensation of Ethyl Cyanoacetate, Salicylaldehyde, and Certain Aldehydes in the Presence of Ammonium Acetate
作者:Akio Sakurai、Hiroshi Midorikawa、Yasuo Hashimoto
DOI:10.1246/bcsj.44.1677
日期:1971.6
Various 1-substituted benzopyranopyridines were readily prepared by the condensation of ethyl cyanoacetate and salicylaldehyde (or 3-methoxysalicylaldehyde) with aliphatic aldehydes (propion, n-butyl, n- and isovaleraldehyde) in the presence of ammonium acetate. On the other hand, condensation with aromatic aldehydes such as benzaldehyde and o-, m-, or p-substituted benzaldehydes gave 2-aryl-benzopyranopyrimidines
在乙酸铵的存在下,通过氰基乙酸乙酯和水杨醛(或 3-甲氧基水杨醛)与脂肪醛(丙醛、正丁基、正和异戊醛)的缩合反应,很容易制备各种 1-取代的苯并吡喃并吡啶。另一方面,与芳香醛如苯甲醛和邻、间或对位取代的苯甲醛缩合得到 2-芳基-苯并吡喃并嘧啶。