[4+2] Cycloaddition of α,β-unsaturated acid anhydrides to 2-furylpiperidin-4-ones: The short route to annulated 8,10a-epoxypyrido[2,1-<i>a</i>]isoindoles
作者:Fedor I. Zubkov、Inga K. Airiyan、Anastasiya A. Dzyubenko、Nataliya I. Yudina、Vladimir P. Zaytsev、Eugeniya V. Nikitina、Alexey V. Varlamov、Victor N. Khrustalev、Dmitry G. Grudinin
DOI:10.1002/jhet.316
日期:——
their 7‐carboxylic derivatives is reported. The key synthetic step includes the intramolecular exo‐Diels–Alder reaction (IMDAF) of N‐furfurylacrylamide, produced in situ from 2‐furylpiperidin‐4‐ones and α,β‐unsaturated acid anhydrides. The synthesis of the title compounds can be performed under mild conditions with a high level of regio‐ and stereoselectivity. The same strategy has been successfully
报道了一步一步制备8,10a-环氧吡啶并[2,1- a ]异吲哚及其7-羧酸衍生物的方法。关键的合成步骤包括N-糠基丙烯酰胺的分子内exo -Diels-Alder反应(IMDAF),它是由2-糠基哌啶-4-酮和α,β-不饱和酸酐原位产生的。标题化合物的合成可以在温和条件下进行,具有很高的区域和立体选择性。从马来酸酐和菠菜碱衍生物合成4,9,11a-环氧咪唑并[4',5':3,4]吡啶[2,1- a ]异吲哚-8-羧酸已成功采用了相同的策略– 4 -(2-呋喃基)-4,5,6,7-四氢-3 H-咪唑[4,5- c]吡啶。J.杂环化学。(2010)。