Silicon-Initiated Carbonylative Carbotricyclization and [2+2+2+1] Cycloaddition of Enediynes Catalyzed by Rhodium Complexes
作者:Bibia Bennacer、Masaki Fujiwara、Seung-Yub Lee、Iwao Ojima
DOI:10.1021/ja054221m
日期:2005.12.1
silicon-initiated cascade carbonylative carbotricyclization (CO-SiCaT) process. It has also been found that the 5-7-5 fused tricyclic products can be obtained from the same type of enediynes and CO through a novel intramolecular [2+2+2+1] cycloaddition process. The characteristics of these two tricyclization processes and the fundamental differences in their reaction mechanisms are discussed. This novel higher-order
dodec-11-ene-1,6-diynes 或它们的杂原子同系物与由 Rh(acac)(CO)2 催化的氢硅烷在环境温度和 CO 压力下反应得到相应的稠合 5-7-5 三环产物, 5-oxo-1,3a,4,5,7,9-hexahydro-3H-cyclopenta[e]azulenes 或它们的杂原子同系物,通过独特的硅引发的级联羰基化碳三环化 (CO-SiCaT) 工艺以优异的产率获得。还发现5-7-5稠合三环产物可以通过新型的分子内[2+2+2+1]环加成过程由相同类型的烯二炔和CO获得。讨论了这两种三环化过程的特点及其反应机理的根本区别。这种新型的高级环加成反应也已成功应用于 undeca-5 的三环化反应,10-diyn-1-als,提供相应的带有七元内酯部分的 5-7-5 稠环产物。还讨论了烯二炔和二炔底物的相关 [2+2+2] 三环化。这些新发现的反应可以同时构建多个键,在