通过erlenmeyer-ploechl反应合成2 H -chromeno [4,3- b ]吡啶-2,5(1 H)-二酮和相关的杂环
摘要:
由4-烷基氨基香豆素-3-甲醛1和5(4 H)-合成1,2-二氢-5 H- [1]苯并吡喃并[4,3 - b ]吡啶-2,5-二酮4a-j。由N-乙酰基甘氨酸(2a)和马尿酸(2b)衍生而来的恶唑啉酮(azalactones )。中间体3(仅3j被分离)通过打开内酯基内酯和连续形成稠合的2-吡啶酮4进行自发的再循环。尝试合成所选的2 H -chromeno [3,4- f ] -1,7-萘啶6通过Vilsmeier的4e反应失败。相反,发生N-脱乙酰化,然后将氨基甲酰化为甲am7a。另外,通过使3-甲酰基-2-吡啶酮8与衍生自2a的乙二酸内酯和乙酸酐缩合获得吡喃并吡啶9a。
Ivanov, Ivo C.; Karagiosov, Stoyan K.; Simeonov, Mario F., Liebigs Annalen der Chemie, 1992, # 3, p. 203 - 208
作者:Ivanov, Ivo C.、Karagiosov, Stoyan K.、Simeonov, Mario F.
DOI:——
日期:——
A Convenient Approach to the Synthesis of Dialkyl 5‐Oxo‐1,2‐dihydro‐5<i>H</i>‐chromeno [4,3‐<i>b</i>]pyridine‐2,3‐dicarboxylates
作者:Toma N. Glasnov、Ivo C. Ivanov
DOI:10.1080/00397910801929465
日期:2008.4.1
Coumarin and its analogs are considered privileged scaffolds in the current synthetic and pharmacological research. The chemical behavior of enaminocarbaldehydes of the coumarin moiety under intramolecular Wittig reaction conditions in the presence of triphenylphosphine and dimethyl or diethyl acetylenedicarboxylates has been studied, resulting in the isolation of a series of dimethyl and diethyl 5-oxo-1,2-dihydro-5H-chromeno[4,3-b]pyridine-2,3-dicarboxylates in good to high yields.