Our findings on the bifunctional squaramide‐catalyzed enantioselective conjugateaddition of β‐ketoamides to nitroolefins are disclosed. It appears that simple acyclic methylene β‐ketoamides, unlike the extensively studied β‐ketoesters, afford the products in excellent diastereoselectivities, and maintain high yields and enantioselectivities. Moreover, competition and kinetic studies were conducted
Diazo- and Transition-Metal-Free CH Insertion: A Direct Synthesis of β-Lactams
作者:Luis F. R. Gomes、Luís F. Veiros、Nuno Maulide、Carlos A. M. Afonso
DOI:10.1002/chem.201404990
日期:2015.1.19
Carbene intermediates are very useful species for a range of reactions including CHinsertions and cycloadditions. They are most commonly generated by metal‐catalyzed release of nitrogen gas from diazo precursors. Herein, we present a novel CHinsertion of simple β‐ketoamide substrates, through reaction with (diacetoxyiodo)benzene (DIB) in the presence of a base. This unprecedented transformation
In Situ-Generated Iodonium Ylides as Safe Carbene Precursors for the Chemoselective Intramolecular Buchner Reaction
作者:Shanyan Mo、Xinhao Li、Jiaxi Xu
DOI:10.1021/jo501628h
日期:2014.10.3
A chemoselective intramolecular Buchner reaction employing iodoniumylides as safe carbene precursors has been developed. Iodoniumylides are generated in situ from N-benzyl-2-cyanoacetamides and PhI(OAc)2 in the presence of base and undergo intramolecular Buchner reaction under catalysis from Cu(OAc)2·H2O, affording fused cyclohepta-1,3,5-triene derivatives in up to 85% yield. The N,N-dibenzyl-2-cyanoacetamides
A completely regioselective and highly enantioselective organocatalytic multicomponent synthesis of 1,2,3,4-tetrahydropyridines is described.
描述了一种完全区域选择性和高对映选择性的有机催化多组分合成1,2,3,4-四氢吡啶。
Toward the Synthesis of Muironolide A: Synthesis and Structure of Heteroleptic Lanthanide-Terpyridine Complexes with 2-Oxo Amides
作者:Kyle Young、Qing Xiao、Armen Zakarian
DOI:10.1002/ejoc.201500174
日期:2015.4
lanthanide-catalyzed intramolecular Diels–Alder (IMDA) reaction en route to the synthesis of muironolide A is described, along with detailed crystallographic structural studies of lanthanide complexes between β-oxo amides and terpyridine. The X-ray crystallographic studies are first examples of nonsymmetric heterolepticcomplexes of lanthanides with β-oxo carbonyl compounds, which reveal several structural
描述了在合成 muironolide A 途中的镧系元素催化的分子内 Diels-Alder (IMDA) 反应,以及 β-氧代酰胺和三联吡啶之间的镧系元素配合物的详细晶体结构研究。X 射线晶体学研究是镧系元素与 β-氧代羰基化合物的非对称杂配络合物的第一个例子,它揭示了几种结构特性,可用于开发与镧系元素的催化反应。