Enhancement of Cyclopropanation Chemistry in the Silver-Catalyzed Reactions of Aryldiazoacetates
作者:Janelle L. Thompson、Huw M. L. Davies
DOI:10.1021/ja069314y
日期:2007.5.1
AgSbF6 is an effective catalyst for the reactions of donor/acceptor substituted carbenoids and shows a very different reactivity profile from the traditional rhodium-catalyzed reactions. Most notably, cyclopropanation of sterically hindered alkenes is favorable, and products due to a Wolff rearrangement are not observed. Yields of products obtained are often high (54−96%) with excellent diastereoselectivity
An open and shut case: An interesting bromine‐catalyzed tandem ringopening/cyclization reaction of bicyclic vinylcyclopropanes with chloramine‐T ([TsNCl]Na) has been demonstrated to furnish chiral bicyclic amidine derivatives in good yield. A plausible mechanism has been proposed based on the experimental observations. Ts=p‐toluenesulfonyl.