[4+2] Annulation of Vinyl Ketones Initiated by a Phosphine-Catalyzed Aza-Rauhut-Currier Reaction: A Practical Access to Densely Functionalized Tetrahydropyridines
作者:Zugui Shi、Qinjie Tong、Wendy Wen Yi Leong、Guofu Zhong
DOI:10.1002/chem.201201318
日期:2012.8.6
The first example of phosphine catalyzed aza‐Rauhut–Currier reaction initiated [4+2] annulation of vinyl ketones with N‐sulfonyl‐1‐aza‐1,3‐dienes has been disclosed. Under the ambient conditions, this protocol provides a practical access to valuable densely functionalized tetrahydropyridines in good to excellent yields and high diastereoselectivities (see scheme).
Chemoselectivity in the Reaction of 2-Diazo-3-oxo-3-phenylpropanal with Aldehydes and Ketones
作者:Jiantao Zhang、Jiaxi Xu
DOI:10.1002/hlca.201200532
日期:2013.9
2‐diazo‐3‐oxo‐3‐phenylpropanal (1) with aldehydes and ketones in the presence of Et3N was investigated. The results indicate that 1 reacts with aromatic aldehydes with weak electron‐donating substituents and cyclic ketones under formation of 6‐phenyl‐4H‐1,3‐dioxin‐4‐one derivatives. However, it reacts with aromatic aldehydes with electron‐withdrawing substituents to yield 1,3‐diaryl‐3‐hydroxypropan‐1‐ones, accompanied
One of the most studied properties of novel organic solvents is represented by their use as media for many chemical reactions. In this field Ionic Liquids (ILs) and more recently...
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