The first synthesis of cyclopropanone acetals from the reaction of Fischer carbene complexes with ketene acetals
作者:Siu Ling B. Wang、Daniel R. Goldberg、Xuejun Liu、Jing Su、Qi-Huang Zheng、Vincent Liptak、William D. Wulff
DOI:10.1016/j.jorganchem.2005.08.025
日期:2005.12
two products as the zwitterionic intermediate resulting from nucleophilic addition of the ketene acetal to the carbene carbon. A 1,3-migration of the methoxyl group to the cationic center leads to the ortho ester and a ring closure by backside attack leads to the cyclopropanone acetal. A double-labeling experiment shows that the 1,3-migration occurs by an intramolecular process that is proposed to involve