A Brønsted Acid Mediated Cascade Enone Synthesis from Aldehydes Containing a Tethered Propargylsilane
作者:Rui Ramalho、Peter J. Jervis、Benson M. Kariuki、Alexander C. Humphries、Liam R. Cox
DOI:10.1021/jo702351s
日期:2008.2.1
MeSO3H effects the intramolecular allenylation of a series of aldehydes 1 to provide allenyl alcohol product 3 as a single diastereoisomer. Cyclization proceeds rapidly at −78 °C. However, when the reaction is performed at room temperature, aldehyde 1 provides enone product 7 instead. A mechanism for the formation of this product is proposed in which the initially formed allenyl alcohol 3 undergoes