Reductive Coupling of Phthalimides with Ketones and Aldehydes by Low-Valent Titanium: One-Pot Synthesis of Alkylideneisoindolin-1-ones
作者:Naoki Kise、Yusuke Kawano、Toshihiko Sakurai
DOI:10.1021/jo402125u
日期:2013.12.20
The reductive coupling of phthalimides with ketones and aldehydes by Zn-TiCl4 in THF gave two- and four-electron reduced products, 3-hydroxy-3-(1-hydroxyalkyl)isoindolin-1-ones and alkylideneisoindolin-1-ones, selectively by controlling the reaction conditions. Therefore, the one-pot synthesis of alkylideneisoindolin-1-ones from phthalimides was effected by this reaction. Although the alkylideneisoindolin-1-ones
Zn-TiCl 4在THF中将邻苯二甲酰亚胺与酮和醛还原偶联,可选择性地产生两电子还原产物和三电子还原产物3-羟基-3-(1-羟烷基)异吲哚啉-1-酮和亚烷基异异吲哚-1-酮。通过控制反应条件。因此,通过该反应实现了由邻苯二甲酰亚胺的一锅法合成亚烷基异吲哚啉-1-酮。尽管在大多数情况下,由邻苯二甲酰亚胺和醛制得的亚烷基异二氢吲哚-1-酮是作为几何异构体的混合物形成的,但在猫体内通过回流可以提高几何比。PPTS /甲苯。异构化后,N-甲基取代的亚烷基亚异吲哚啉-1-酮(X = Me,R 1 = R,R 2 = H)的E-异构体优先获得N-未取代的亚烷基亚异吲哚啉-1-酮(X = H,R 1= H,R 2= R)的Z-异构体。