Synthesis of polycyclic indolizine derivatives via one-pot tandem reactions of N-ylides with dichloro substituted α,β-unsaturated carbonyl compounds
作者:Yun Liu、Hua-You Hu、Qing-Jian Liu、Hong-Wen Hu、Jian-Hua Xu
DOI:10.1016/j.tet.2006.12.050
日期:2007.2
Convenient and regioselective syntheses of 1,2-annulated, and 1,2-, 5,6- and 1,2-, 7,8-bisannulated polycyclic indolizine derivatives have been achieved by one-pot tandem reactions of cyclic N-ylides derived from the corresponding N-substituted pyridinium, quinolinium, and isoquinolinium salts 1–3 with dichloro substituted α,β-unsaturated carbonyl compounds 4–7. The reactions of the N-ylides with 2
通过一锅串联的衍生自环状N酰基的串联反应可以方便地和区域选择性地合成1,2-环和1,2-,5,6-和1,2-,7,8-双环的多吲哚嗪衍生物从相应的ñ取代的吡啶鎓,喹啉鎓,和异喹啉盐1 - 3与二氯取代的α,β不饱和羰基的化合物4 - 7。所述的反应Ñ -ylides与2,3- dichloroindenone 4,3,4- dichlorocoumarin 5,和4a,6,7,8a四氯-1,4- methanonaphthalene -5,8-二酮6依次进行[3 + 2]环加成反应,并从环加合物中除去氯化氢。另一方面,N-酰基化物与2,3-二氯-1,4-萘醌7的反应是通过新的反应顺序进行的,得到的产物为15 – 17。