Tandem inter [4+2]/intra [3+2] cycloadditions. 8. Cycloadditions with unactivated dipolarophiles
作者:Scott E. Denmark、C.B.W. Senanayake
DOI:10.1016/0040-4020(96)00642-4
日期:1996.8
The tandem intermolecular [4+2/intramolecular [3+2] cycloaddition of nitroalkenes bearing a pendant olefin is presented. The success of the tandem process is remarkable in view of the potential for intramolecular reaction with the tethered alkene. Cycloadditions of di- and trisubstituted nitroalkenes bearing two- and three-methylene tethers which contain mono-, di- and trisubstituted olefins are described
提出了带有侧链烯烃的硝基烯烃的串联分子间[4 + 2 /分子内[3 + 2]环加成。考虑到与束缚的烯烃的分子内反应的潜力,串联方法的成功是显着的。描述了带有二和三亚甲基醚的二和三取代硝基烯烃的环加成,所述二和三亚甲基醚含有单,二和三取代的烯烃。在所有情况下,串联过程都是高收率的(以正丁基乙烯基醚为亲二烯体)和高度立体选择性。所得亚硝基缩醛的氢解可干净地高产率地产生稠合的吡咯烷。