Rhodium-Catalyzed Ring Expansion of Cyclopropanes to Seven-membered Rings by 1,5 CC Bond Migration
作者:Xiaoxun Li、Min Zhang、Dongxu Shu、Patrick J. Robichaux、Suyu Huang、Weiping Tang
DOI:10.1002/anie.201104861
日期:2011.10.24
of rhodium: Highly functionalized seven‐membered rings were prepared from substituted cyclopropanes by a RhI‐catalyzed tandem isomerization reaction. The π‐acidic RhI catalyst promoted the formation of an allene intermediate by a 1,3 acyloxy migration of a propargyl ester and a subsequent net 1,5 migration of a cyclopropane CC bond.
铑的金色一面:通过 Rh I催化的串联异构化反应,由取代的环丙烷制备高度官能化的七元环。π-酸性Rh I催化剂通过炔丙酯的1,3酰氧基迁移和随后环丙烷C- C键的净1,5迁移促进丙二烯中间体的形成。