Abstract Different types of starting materials have been designed and their ability to undergo cascade reactions has been investigated. New polycycles containing five-, six-, and seven-memberedrings are described via original cascade reactions. The process works via a twofold cyclocarbopalladation followed by C(sp2)-H or C(sp3)-H activation. During these cascades, the palladium is moving several times
摘要 已经设计了不同类型的起始材料,并研究了它们进行级联反应的能力。通过原始级联反应描述了包含五、六和七元环的新多环。该过程通过双重环碳钯化作用进行,然后是 C(sp2)-H 或 C(sp3)-H 活化。在这些级联过程中,钯沿着碳结构多次移动,形成三个新的 CC 键和三个新的循环。
Cascade Cyclization: An Easy Access to Highly Unsaturated Polycyclic Ring Systems through a Tandem Stille/[4 + 2] Reaction under Mild Conditions
polycyclic compounds 1a-c, 2, and 3 has been performed through a tandem Stille/[4 + 2] cascade reaction from cyclic bis(enoltrifluomethanesulfonate) 4a-c, 5, and 6, respectively. The reaction proceeds very efficiently in a one-pot operation at roomtemperature in DMF in the presence of a catalytic amount of Pd(CH(3)CN)(2)Cl(2) and LiCl.[reaction: see text]