Efficient Construction of α-Spirocyclopropyl Lactones: Iridium-Salen-Catalyzed Asymmetric Cyclopropanation
作者:Masami Ichinose、Hidehiro Suematsu、Tsutomu Katsuki
DOI:10.1002/anie.200805527
日期:2009.4.14
carbene source, the seven‐membered rings upon subsequent hydrolysis and Cope rearrangement when 1,3‐dienes were used (see example). The α‐spirocyclopropyl lactones were formed with high E (trans) selectivity and high enantioselectivity, and cyclopropanation occurred at the terminal double bond in 1,3‐dienes with excellent regioselectivity.
三元和七元环是通过末端烯烃与乙烯基重氮内酯作为卡宾源的标题反应而构建的,随后进行水解时的七元环和当使用1,3-二烯时的Cope重排(请参见示例)。α-螺环丙基内酯的形成具有高E(反式)选择性和高对映选择性,并且环丙烷化发生在1,3-二烯的末端双键上,具有良好的区域选择性。