Regioselective TfOH-mediated hydroamidation of ynamides with nitriles
摘要:
A new TfOH-mediated reaction of ynamides with nitriles as nucleophiles has been developed. The reaction works efficiently under mild reaction conditions to afford a new class of alpha-acylaminoenamides readily via the intermediacy of keteniminium ion. The reaction displays generality and a broad substrates scope. Additionally, the alpha-acylaminoenamides could be transformed to highly substituted pyridine, 4-aminopyrimidine or isoquinoline cores. (C) 2017 Elsevier Ltd. All rights reserved.
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.
Pauson–Khand cycloaddition reactions of chiral ynamides. Observation of an unusual endo-addition with norbornadiene
作者:Lichun Shen、Richard P. Hsung
DOI:10.1016/j.tetlet.2003.10.064
日期:2003.12
Pauson–Khandcycloadditions using chiral ynamides are achieved in modest to good yields with excellent regioselectivity and modest stereoselectivity. An unusual endo addition is found when using norbornadiene and substituted ynamides, leading to cycloadducts that were not observed in previous studies using ynamides or ynamines.
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.
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.
Highly Stereoselective Saucy−Marbet Rearrangement Using Chiral Ynamides. Synthesis of Highly Substituted Chiral Homoallenyl Alcohols
作者:Michael O. Frederick、Richard P. Hsung、Robert H. Lambeth、Jason A. Mulder、Michael R. Tracey
DOI:10.1021/ol030061c
日期:2003.7.1
[GRAPHICS]A highly stereoselective Saucy-Marbet rearrangement using chiral ynamides and propargyl alcohols is described here. This rearrangement can be catalyzed by para-nitrobenzenesulfonic acid leading to high diastereoselectivities for a range of different chiral propargyl alcohols and ynamides in a stereochemically intriguing matched, mismatched, or indifferent manner. This provides an excellent entry to highly substituted chiral homoallenyl alcohols.