Highly Stereoselective Synthesis of Novel α-Haloenamides via a Mild and Efficient Hydrohalogenation of Ynamides
摘要:
A highly stereoselective preparation of novel chiral (E)-alpha-haloenamides under mild conditions utilizing magnesium halide salts is described. This unexpected mild and efficient hydrohalogenation reaction highlights another synthetic utility of ynamides.
The First Stereoselective Ficini−Claisen Rearrangement Using Chiral Ynamides
作者:Jason A. Mulder、Richard P. Hsung、Michael O. Frederick、Michael R. Tracey、Craig A. Zificsak
DOI:10.1021/ol020037j
日期:2002.4.1
[GRAPHICS]The first asymmetric Ficini-Claisen rearrangement using chiral ynamides is described. At relatively low temperatures, the Ficini-Claisen rearrangement can be efficiently promoted by p-nitrobenzenesulfonic acid leading to high diastereoselectivity for a range of different allylic alcohols and chiral ynamides.