α-position were obtained by phosphine-initiated cyclization of enynes bearing a carbonyl group at the ene-side in the presence of aldehyde in high yield. The reaction may involve the 1,6-addition of phosphine toward the enynes, ring closure, and Wittig reaction of the ylid resulted from the cyclization with aldehyde.
通过在醛存在下在醛存在下以膦开始的在烯侧带有羰基的烯炔的膦引发的环化反应,可以得到在α-位具有双键的
呋喃。该反应可能涉及将膦1,6-加成至烯炔,闭环和由醛环化导致的
碘的Wittig反应。