[reaction: see text] Various ene-tosylynamides react with platinum(II) chloride and lead to bicyclic nitrogenated heterocycles. This unprecedented and easily operated process can be coupled with a hydrolysis of the intermediate cyclic tosylenamides in a one-pot transformation, which provides cyclobutanones.
Ring-closing metathesis of ene-ynamide, which has alkene and ynamide moieties in a molecule, using a second-generation ruthenium carbene complex produced nitrogen-containing heterocycles, which have a dienamide moiety, in high yields. Diels-Alder reaction of the cyclized product with dienophile proceeded smoothly to give an indole or quinoline derivative in high yield. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of Cyclic Dienamide Using Ruthenium-Catalyzed Ring-Closing Metathesis of Ene-Ynamide
作者:Nozomi Saito、Yukako Sato、Miwako Mori
DOI:10.1021/ol017298y
日期:2002.3.1
[GRAPHICS]Ring-closing metathesis of ene-ynamide using the second-gene ration Grubbs' catalyst produced nitrogen-containing heterocycles, which have dienamide moieties, in high yields. Diels-Alder reaction of the cyclized product and dienophile proceeded smoothly to afford a bi- or tricyclic compound.
Radical cascade cyclizations and platinum(II)-catalyzed cycloisomerizations of ynamides
Ynamides are tested as new partners in radical and organometallic transformations. A radical cascade involving a 5-exo-dig cyclization followed by a 6-endo-trig radical trapping transforms ynamides into hetero-polycyclic compounds such as isoindoles, isoindolinones and pyrido-isoindolones. Various ene–tosylynamides react with platinum(II) chloride and lead to bicyclic nitrogenated heterocycles. This