A Catalytic Intermolecular Formal Ene Reaction between Ketone-Derived Silyl Enol Ethers and Alkynes
作者:Stephen D. Holmbo、Nicole A. Godfrey、Joshua J. Hirner、Sergey V. Pronin
DOI:10.1021/jacs.6b06847
日期:2016.9.28
A catalytic formal ene reaction between ketone-derived silylenolethers and terminal alkynes is described. This transformation is uniquely capable of bimolecular assembly of 2-siloxy-1,4-dienes and can be used to access β,γ-unsaturated ketones containing quaternary carbons in the α-position.
Electrophilic alkyne activation of nitrogen-containing 7-siloxy-6-en-1-ynes by W(CO)5(L) allows the preparation of synthetically useful heterocycles. Two types of cyclized products, 5-exo and 6-end...