Palladium-Catalyzed Ring Opening of Aminocyclopropyl Ugi Adducts
作者:Laurent El Kaïm、Laurence Grimaud、Aurélie Dos Santos、Romain Ramozzi
DOI:10.1055/s-0031-1290312
日期:2012.2
The ring opening of aminocyclopropanes triggered by activation with an intramolecular arylpalladium(II) iodide complex is an interesting strategy for the synthesis of nitrogen heterocycles and a valuable Ugi postcondensation-type transformation. Six- and seven-membered-ring cyclic enamines may be obtained. aminocyclopropanes - ring opening - palladium - Ugi - Ugi-Smiles
作者:Laurent El Kaïm、Laurence Grimaud、Simon Wagschal
DOI:10.1021/jo100759b
日期:2010.8.6
Herein, we present a newroute to highly substituted pyrrolo[2,3-d]pyrimidines featuring a Ugi−Smiles/Sonogashira cascade followed by an efficient base-catalyzed intramolecular cyclization. When formaldehyde is chosen as input in the Ugi−Smiles step, aromatic fused systems are eventually obtained through the isomerization of an exo-alkylidene intermediate.
在这里,我们提出了一种新的途径,以具有Ugi-Smiles / Sonogashira级联的高取代的吡咯并[2,3- d ]嘧啶为代表,随后进行了有效的碱催化分子内环化反应。当在Ugi-Smiles步骤中选择甲醛作为输入时,最终通过外亚烷基中间体的异构化获得芳族稠合体系。
Studies on Pyrimidine Derivatives; XXXV<sup>1</sup>. Iodination of 2-Aminopyrimidines, 4-Aminopyrimidines, and 4-Pyrimidinones with Iodine Chloride<i>in situ</i>
The use of ortho-iodonitrophenol in Ugi-Smiles reaction coupled with Heck cyclization gives new access to indole scaffolds. The sequence can be performed in a one-pot reaction if the residual isocyanide is neutralized prior to the addition of the palladium catalyst.
EDO KIYOTO; SAKAMOTO TAKAO; YAMANAKA HIROSHI, CHEM. AND PHARM. BULL., 1978, 26, NO 12, 3843-3850