It is observed that mesylate 1 on exposure to Li(Ot-Bu)(3)AlH in refluxing toluene rearranges selectively to the 11-oxatricyclo[5.3.1.0(2,6)]undecane derivative 3. A similar rearrangement, leading to a bridged tricyclic ether (14 --> 5), has been used as the key to the total synthesis of furanether B (4), a naturally occurring lactarane sesquiterpene, with the readily available ketone 8 as the starting
观察到,在回流的
甲苯中,暴露于Li(Ot-Bu)(3)AlH中的
甲磺酸盐1选择性重排为11-氧杂
三环[5.3.1.0(2,6)]
十一烷衍
生物3。类似的重排导致桥连的三
环醚(14-> 5)已用作
呋喃醚B(4)的全合成的关键,
呋喃醚B(4)是天然存在的内芳烷
倍半萜烯,以易得的酮8为起始原料。
天然产物的合成是通过基于Pummerer诱导的环化反应的环化方法完成的。