The cyclization of 2-(1-alkynyl)-2-alken-1-ones proceeded smoothly in the presence of various nucleophiles with a catalytic amount of Bu4N[AuCl4] in [bmim]BF4, leading to the formation of highly substituted furans. This system is air-stable and recyclable. The catalyst is inexpensive and readily available.
在[bmim]BF4 中加入一定量的 Bu4N[AuCl4] 催化剂,在各种亲核剂的作用下,2-(1-炔基)-2-烯-1-酮的环化反应顺利进行,最终生成了高取代度的
呋喃。该系统在空气中稳定,可循环使用。催化剂价格低廉,易于获得。