reaction into a functionalized allylic bromide. Merger of the two building blocks is subsequently accomplished in aqueous solution with powdered indium metal serving as the initiator. Once the lactone ring is crafted, the end products are generated by application of ring-closing metathesis. The central issues surrounding this final step are the effects of the stereochemical disposition of the side chains
报告了针对顺式或反式融合到较大环的α-亚
甲基内酯的一般合成的程序。该协议源于两个链长相同或不同的 ω-不饱和醛。其中之一最初通过 Baylis-Hillman 反应转化为功能化的烯丙基
溴化物。随后在
水溶液中以粉状
铟金属作为
引发剂,实现两个结构单元的合并。内酯环制成后,通过应用闭环复分解生成最终产品。围绕这最后一步的核心问题是侧链的立体
化学布置的影响、环应变的后果以及双键的位置对环化效率的影响。