Reaction of phenyldimethylsilyl-copper with 1,2-propadiene followed by Pd0 catalyzed coupling of the resulting copper intermediate with alkenyl halides affords allylsilane-containing dienes in high yield. Coupling with vinyl bromide gives 2-phenyldimethylsilylmethylbuta-1,3-diene which is an isoprenyl building block for the synthesis of (±)-Ipsenol and (±)-Ipsdienol, the aggregation pheromones of the Ips bark beetle. The photochemical [2 + 2] cyclization of Ipsdienol was also studied.
苯基二甲基
硅基
铜与 1,2-
丙二烯反应,然后在 Pd0 催化下将生成的
铜中间体与烯烃卤化物偶联,就能以高产率生成含烯丙
硅烷的二烯。与
乙烯基溴偶联可得到 2-苯基二甲基
硅甲基丁-1,3-二烯,它是合成(±)-Ipsenol 和(±)-Ipsdienol 的异
戊烯基结构单元,而 (±)-Ipsenol 和 (±)-Ipsdienol 是 Ips 树皮甲虫的聚集信息素。此外,还研究了 Ipsdienol 的光
化学 [2 + 2] 环化过程。