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.
A Copper-Catalyzed C−N Bond Formation Involving sp-Hybridized Carbons. A Direct Entry to Chiral Ynamides via N-Alkynylation of Amides
摘要:
A copper-catalyzed new C-N bond formation involving a sp-hybridized carbon is described here leading to a facile entry for syntheses of chiral ynamides. This direct N-alkynylation of amides should have a significant impact on the future development of synthetic methodologies employing ynamides.
Copper-Catalyzed Alkynylation of Amides with Potassium Alkynyltrifluoroborates: A Room-Temperature, Base-Free Synthesis of Ynamides
作者:Kévin Jouvin、François Couty、Gwilherm Evano
DOI:10.1021/ol101322k
日期:2010.7.16
An efficient copper-mediated method for the coupling of potassium alkynyltrifluoroborates with nitrogen nucleophiles is reported. This reaction provides the first base-free and room-temperature synthesis of ynamides and allows for an easy preparation of these useful building blocks.
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.
Synthesis of chiral allenes from ynamides through a highly stereoselective Saucy–Marbet rearrangement
作者:Kimberly C.M. Kurtz、Michael O. Frederick、Robert H. Lambeth、Jason A. Mulder、Michael R. Tracey、Richard P. Hsung
DOI:10.1016/j.tet.2005.11.087
日期:2006.4
A highly stereoselective Saucy-Marbet rearrangement using chiral ynamides and propargyl alcohols is described here. This rearrangement can be catalyzed by para-nitrobenzenesulfonic acid and leads to high diastereoselectivities for a range of different chiral propargyl alcohols and ynamides in a stereochemically intriguing matched, mismatched or indifferent manner. The stereoselective Saucy-Marbet rearrangement of ynamides provides an excellent entry to highly substituted chiral homo allenyl alcohols. (c) 2006 Elsevier Ltd. All rights reserved.
A Copper-Catalyzed C−N Bond Formation Involving sp-Hybridized Carbons. A Direct Entry to Chiral Ynamides via N-Alkynylation of Amides
作者:Michael O. Frederick、Jason A. Mulder、Michael R. Tracey、Richard P. Hsung、Jian Huang、Kimberly C. M. Kurtz、Lichun Shen、Christopher J. Douglas
DOI:10.1021/ja021304j
日期:2003.3.1
A copper-catalyzed new C-N bond formation involving a sp-hybridized carbon is described here leading to a facile entry for syntheses of chiral ynamides. This direct N-alkynylation of amides should have a significant impact on the future development of synthetic methodologies employing ynamides.
Highly Stereoselective Synthesis of Novel α-Haloenamides via a Mild and Efficient Hydrohalogenation of Ynamides
作者:Jason A. Mulder、Kimberly C. M. Kurtz、Richard P. Hsung、Heather Coverdale、Michael O. Frederick、Lichun Shen、Craig A. Zificsak
DOI:10.1021/ol0300266
日期:2003.5.1
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.