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...
[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