Stereoselective Construction of 1,3-Disilylcyclopentane Derivatives by Scandium-Catalyzed [3+2] Cycloaddition of Allylsilanes to β-Silylenones
作者:Kazuhiro Okamoto、Eisuke Tamura、Kouichi Ohe
DOI:10.1002/anie.201404218
日期:2014.9.15
The Sc(OTf)3‐catalyzed [3+2] cycloaddition of allylsilanes to β‐silyl‐α,β‐unsaturated ketones (β‐silylenones) has been developed to form five‐membered syn‐1,3‐disilylketones diastereoselectively through the rearrangement of the silicon substituents on the allylsilane. Stabilization of the carbocation intermediates by a double silicon effect plays a key role in directing the course of the reaction to
A Conjugate Addition of Allylsilanes to α,β-Unsaturated Ketones Catalyzed by Trityl Perchlorate
作者:Masaji Hayashi、Teruaki Mukaiyama
DOI:10.1246/cl.1987.289
日期:1987.2.5
A conjugateaddition of allylsilanes to α,β-unsaturatedketones was effectively promoted by a catalytic amount of trityl perchlorate to give the corresponding Michael adducts in good yields.
作者:Justin A. Hilf、Michael S. Holzwarth、Scott D. Rychnovsky
DOI:10.1021/acs.joc.6b01370
日期:2016.11.4
Pyridine rings are common structural motifs found in a number of biologically active compounds, including some top-selling pharmaceuticals. We have developed a new approach to access substituted pyridines. The method aims to provide a reliable synthesis of a diverse range of substituted pyridines through a three-step procedure. Readily available enones are first converted into 1,5-dicarbonyls through