Abstract A novel methodology has been devised for the chemoselective reduction of enones involving the use of n Bu3SnH and azobisisobutyronitrile. The 1,4-reduction of variously substituted α,β-unsaturated cyclic and acyclic enones has been successfully carried out under free radical reaction conditions. The reaction has been determined to proceed via single-electron transfer. [Supplementary materials
摘要 已经设计了一种涉及使用 n Bu3SnH 和偶氮二异丁腈化学选择性还原烯酮的新方法。各种取代的α,β-不饱和环状和无环烯酮的1,4-还原已在自由基反应条件下成功进行。已确定该反应通过单电子转移进行。[本文提供补充材料。访问出版商的 Synthetic Communications® 在线版,获取以下免费补充资源:完整的实验和光谱细节。] 图形摘要
Enantioselective α‐Carbonylative Arylation for Facile Construction of Chiral Spirocyclic β,β′‐Diketones
作者:Ting Wu、Qinghai Zhou、Wenjun Tang
DOI:10.1002/anie.202101668
日期:2021.4.26
We herein describe the first enantioselective α‐carbonylative arylation, providing a diverse set of chiral spiro β,β′‐diketones bearing various ring sizes and functionalities in high yields and good to excellent enantioselectivities. Calculations suggest the transformation proceeds through reductive elimination instead of nucleophilic addition pathway.
A regioselective [3 + 2] cycloaddition reaction of 2-benzylidene-1-indenones with functional olefins to access indanone-fused 2D/3D skeletons
作者:Yi-Hang Deng、Chuan-Bao Zhang、Jun-Jie Sun、Wen-Li Xu、Ji-Ya Fu
DOI:10.1039/d3ob00559c
日期:——
The regioselective [3 + 2] cycloadditionreaction of 2-benzylidene-1-indenones with functional olefins was established with DABCO as a base under mild conditions. Using this approach, a series of diversely substituted indanone-fused cyclopentane polycycles with highly crowded multiple substituents were synthesized in high yields.
A chemoselective iridium-catalyzed transfer hydrogenation of α, β-unsaturatedketones was realized in water. The CC double bonds of 2-benzylidene indanones and analogues were hydrogenated exclusively catalyzed by an iridium complex (0.1 mol%) bearing a pyridine-imidazoline ligand, using a mixture of formic acid/triethyl amine (molar ratio: 5/2) as a hydrogen source in water. A series of 2-benzyl indanones
Michael addition of malononitrile to indenones: Synthesis and characterization of 2-(1-oxo-2,3-dihydro-1<i>H</i>-inden-2-yl) (aryl)(methyl)malononitrile derivatives
ABSTRACT Indanones 3 were prepared from the reaction of indanone (1) with corresponding benzaldehyde derivatives 2, as described in the literature. Then, indenones 3 were subjected to KOtBu-catalyzed Michael addition with malononitrile to give a mixture of diastereomers 5 with a low conversion and no diastereoselection. Utilization of phase-transfer catalyst such as benzyltriethylammonium chloride