Intramolecular [4+2] cycloaddition of furfurylsubstituted homoallylamines to allylhalides, acryloyl chloride and maleic anhydride
作者:Alexey V. Varlamov、Ekaterina V. Boltukhina、Fedor I. Zubkov、Eugenia V. Nikitina、Konstantin F. Turchin
DOI:10.1002/jhet.5570430611
日期:2006.11
chloride or allylhalides provided 3-aza-10-oxatricyclo[5.2.1.01,5]decenes. The tricycles are formed via an initial amide formation followed by a stereoselective exo-IMDAF (Intramolecular Diels-Alder of Furan). In case of competing cycloaddition (for compounds possessing two furan or two dienophilic moieties) the most substituted fivemembered cycle is preferably annulated. Refluxing of 4-R-4-furfurylaminobut-1-enes
的4-(呋喃基-2-基)-4-酰化ř -aminobut -1-烯烃和4- [R -4- furfurylaminobut -1-烯烃与马来酸酐,丙烯酰氯或allylhalides提供3-氮杂-10-氧杂三环[5.2。 1.0 1,5 ]癸烯。三环化合物是通过最初的酰胺形成,然后是立体选择性的exo -IMDAF(分子内Diels-Alder of Furan)形成的。在竞争性环加成的情况下(对于具有两个呋喃或两个双亲二烯基的化合物),最好对最取代的五元环进行环化。4- R -4-糠基氨基丁-1-烯在乙酸酐中的回流导致exo -3-aza-11-oxatricyclo [6.2.1.0 1,6具有伪赤道取代基R -4的十一碳烯。在90-110°C下用PPA处理3-氮杂-10-氧杂三环[5.2.1.0 1,5 ]癸烯可促进环醚的打开,芳构化和分子内环化反应顺序,从而得到相应的四环化合物-四氢异吲哚并[2