Fast Oxy-Cope Rearrangements of Bis-alkynes: Competition with Central C−C Bond Fragmentation and Incorporation in Tunable Cascades Diverging from a Common Bis-allenic Intermediate
作者:Runa Pal、Ronald J. Clark、Mariappan Manoharan、Igor V. Alabugin
DOI:10.1021/jo101838a
日期:2010.12.17
oxy-Cope rearrangements of 1,5-hexadiyn-3,4-olates can be incorporated into cascade transformations which rapidly assemble densely functionalized cyclobutenes or cyclopentenones via a common bis-allenic intermediate. The competition between fragmentation, 4π-electrocyclic closure, and aldol condensation can be efficiently controlled by the nature of the acetylenic substituents. The rearrangement of bis-alkynes
可以将1,5-己二炔-3,4-油酸酯的快速阴离子氧基-Cope重排引入级联转化中,该级联转化可通过常见的双烯丙基中间体快速组装密集官能化的环丁烯或环戊烯酮。炔基取代基的性质可以有效地控制断裂,4π-电环闭合和醛醇缩合之间的竞争。具有两个羟基取代基的双炔烃的重排为ε-二羰基化合物的化学反应打开了一个概念上令人感兴趣的条目,并提出了一种新的rocaglamide / aglafolin类似物的方法。