Highly regio- and stereocontrolled synthesis of β-substituted α-tributylstannyl enamides
作者:David Buissonneaud、Jean-Christophe Cintrat
DOI:10.1016/j.tetlet.2006.02.141
日期:2006.5
The regio- and stereocontrolledsynthesis of β-substituted α-stannyl enamides is reported starting from internal ynamides. The synthesis of new ynamides as well as bis-ynamides is also described. Finally first examples of successful cross-coupling to afford α/β-disubstituted enamides are also reported.
A Simple Procedure for the Synthesis of
<i>β</i>
‐Hydroxyallenamides via Homoallenylation of Aldehydes
作者:Byeong‐Seon Kim、Osvaldo Gutierrez、Marisa C. Kozlowski、Patrick J. Walsh
DOI:10.1002/adsc.201800119
日期:2018.4.3
A simple one‐pot synthesis of β‐hydroxyallenamides is reported. This procedure entails chemo‐ and regioselective hydroboration of 3‐en‐1‐ynyl‐sulfonylamides with Cy2BH followed by homoallenylation of aldehydes to yield β‐hydroxyallenamides (up to 94% yield and >20:1 dr). Controlled synthesis of up to three continuous stereochemical elements was realized. Density functional theory (DFT) calculations
The regiospecific [2 + 2] cycloaddition of cyclic isoimidium salts with ynamides is described. This effort led to the development of the first successful example of a catalyst-free, thermally driven Ficini [2 + 2] cycloaddition process of ynamides with α,β-unsaturated carbonyl compounds, giving the stable cyclobutenamides in excellent yields (up to 99%).